[{"id":3684898,"web_url":"http://patchwork.ozlabs.org/comment/3684898/","msgid":"","list_archive_url":null,"date":"2026-04-30T18:42:36","subject":"Re: [PATCH 1/2] libio: Fix gconv module reference counter overflow in\n swscanf","submitter":{"id":66065,"url":"http://patchwork.ozlabs.org/api/people/66065/","name":"Adhemerval Zanella Netto","email":"adhemerval.zanella@linaro.org"},"content":"On 29/04/26 11:59, Frédéric Bérat wrote:\n> The swscanf family of functions creates a wide-oriented FILE stream\n> on the stack. Initialization of this stream invokes `_IO_fwide`, which\n> clones the global locale's gconv transformation steps via\n> `__wcsmbs_clone_conv`. This increments the reference counter (`__counter`)\n> of the gconv module.\n> \n> Because the FILE stream is stack-allocated, `fclose` cannot be called,\n> and so `__gconv_release_step` is never invoked. The counter leaks,\n> eventually hitting the 32-bit integer overflow limit and aborting the\n> process.\n> \n> To resolve this, we introduce `_IO_wstrfile_fclose_stack`, a dedicated\n> cleanup function for stack-allocated FILE streams. This function invokes\n> `_IO_FINISH` and correctly releases the gconv steps via\n> `__gconv_release_step` without attempting to `free` the FILE pointer.\n> This cleanup function is then hooked into all variants of swscanf right\n> before they return.\n\nLGTM, thanks.\n\nReviewed-by: Adhemerval Zanella \n\n> ---\n> libio/iofwide.c | 15 +++++++++++++++\n> libio/iovswscanf.c | 4 +++-\n> libio/libioP.h | 1 +\n> libio/swscanf.c | 2 +-\n> .../ldbl-128ibm-compat/ieee128-isoc23_swscanf.c | 2 +-\n> .../ldbl-128ibm-compat/ieee128-isoc23_vswscanf.c | 4 +++-\n> .../ldbl-128ibm-compat/ieee128-isoc99_swscanf.c | 2 +-\n> .../ldbl-128ibm-compat/ieee128-isoc99_vswscanf.c | 4 +++-\n> .../ieee754/ldbl-128ibm-compat/ieee128-swscanf.c | 2 +-\n> .../ieee754/ldbl-128ibm-compat/ieee128-vswscanf.c | 4 +++-\n> sysdeps/ieee754/ldbl-opt/nldbl-compat.c | 12 +++++++++---\n> wcsmbs/isoc23_swscanf.c | 2 +-\n> wcsmbs/isoc23_vswscanf.c | 4 +++-\n> wcsmbs/isoc99_swscanf.c | 2 +-\n> wcsmbs/isoc99_vswscanf.c | 4 +++-\n> 15 files changed, 49 insertions(+), 15 deletions(-)\n> \n> diff --git a/libio/iofwide.c b/libio/iofwide.c\n> index 8e71fdd21b..d016aa33ea 100644\n> --- a/libio/iofwide.c\n> +++ b/libio/iofwide.c\n> @@ -251,3 +251,18 @@ __libio_codecvt_length (struct _IO_codecvt *codecvt, __mbstate_t *statep,\n> \n> return result;\n> }\n> +\n> +void\n> +_IO_wstrfile_fclose_stack (FILE *fp)\n> +{\n> + _IO_FINISH (fp);\n> + if (fp->_mode > 0)\n> + {\n> + struct _IO_codecvt *cc = fp->_codecvt;\n> +\n> + __libc_lock_lock (__gconv_lock);\n> + __gconv_release_step (cc->__cd_in.step);\n> + __gconv_release_step (cc->__cd_out.step);\n> + __libc_lock_unlock (__gconv_lock);\n> + }\n> +}\n> diff --git a/libio/iovswscanf.c b/libio/iovswscanf.c\n> index a97f4eed1e..986d94178d 100644\n> --- a/libio/iovswscanf.c\n> +++ b/libio/iovswscanf.c\n> @@ -38,6 +38,8 @@ __vswscanf (const wchar_t *string, const wchar_t *format, va_list args)\n> _IO_strfile sf;\n> struct _IO_wide_data wd;\n> FILE *f = _IO_strfile_readw (&sf, &wd, string);\n> - return __vfwscanf_internal (f, format, args, 0);\n> + int done = __vfwscanf_internal (f, format, args, 0);\n> + _IO_wstrfile_fclose_stack (f);\n> + return done;\n> }\n> ldbl_weak_alias (__vswscanf, vswscanf)\n> diff --git a/libio/libioP.h b/libio/libioP.h\n> index 1485d22619..1d4217e82a 100644\n> --- a/libio/libioP.h\n> +++ b/libio/libioP.h\n> @@ -645,6 +645,7 @@ extern FILE* _IO_new_file_fopen (FILE *, const char *, const char *,\n> \t\t\t\t int);\n> extern void _IO_no_init (FILE *, int, int, struct _IO_wide_data *,\n> \t\t\t const struct _IO_jump_t *) __THROW;\n> +extern void _IO_wstrfile_fclose_stack (FILE *) attribute_hidden;\n> extern void _IO_new_file_init_internal (struct _IO_FILE_plus *)\n> __THROW attribute_hidden;\n> extern FILE* _IO_new_file_setbuf (FILE *, char *, ssize_t);\n> diff --git a/libio/swscanf.c b/libio/swscanf.c\n> index d36ef48258..583253a7dc 100644\n> --- a/libio/swscanf.c\n> +++ b/libio/swscanf.c\n> @@ -37,7 +37,7 @@ __swscanf (const wchar_t *s, const wchar_t *format, ...)\n> va_start (arg, format);\n> done = __vfwscanf_internal (f, format, arg, 0);\n> va_end (arg);\n> -\n> + _IO_wstrfile_fclose_stack (f);\n> return done;\n> }\n> ldbl_strong_alias (__swscanf, swscanf)\n> diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc23_swscanf.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc23_swscanf.c\n> index 6b3915357f..2e95cdf010 100644\n> --- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc23_swscanf.c\n> +++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc23_swscanf.c\n> @@ -35,7 +35,7 @@ ___ieee128_isoc23_swscanf (const wchar_t *string, const wchar_t *format, ...)\n> va_start (ap, format);\n> done = __vfwscanf_internal (fp, format, ap, mode_flags);\n> va_end (ap);\n> -\n> + _IO_wstrfile_fclose_stack (fp);\n> return done;\n> }\n> strong_alias (___ieee128_isoc23_swscanf, __isoc23_swscanfieee128)\n> diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc23_vswscanf.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc23_vswscanf.c\n> index 295321147c..857903b2a6 100644\n> --- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc23_vswscanf.c\n> +++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc23_vswscanf.c\n> @@ -28,6 +28,8 @@ ___ieee128_isoc23_vswscanf (wchar_t *string, const wchar_t *format, va_list ap)\n> FILE *fp = _IO_strfile_readw (&sf, &wd, string);\n> int mode_flags =\n> SCANF_ISOC99_A | SCANF_ISOC23_BIN_CST | SCANF_LDBL_USES_FLOAT128;\n> - return __vfwscanf_internal (fp, format, ap, mode_flags);\n> + int done = __vfwscanf_internal (fp, format, ap, mode_flags);\n> + _IO_wstrfile_fclose_stack (fp);\n> + return done;\n> }\n> strong_alias (___ieee128_isoc23_vswscanf, __isoc23_vswscanfieee128)\n> diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_swscanf.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_swscanf.c\n> index 19b71940dd..2280bae1d0 100644\n> --- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_swscanf.c\n> +++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_swscanf.c\n> @@ -34,7 +34,7 @@ ___ieee128_isoc99_swscanf (const wchar_t *string, const wchar_t *format, ...)\n> va_start (ap, format);\n> done = __vfwscanf_internal (fp, format, ap, mode_flags);\n> va_end (ap);\n> -\n> + _IO_wstrfile_fclose_stack (fp);\n> return done;\n> }\n> strong_alias (___ieee128_isoc99_swscanf, __isoc99_swscanfieee128)\n> diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_vswscanf.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_vswscanf.c\n> index a1b51cb5b6..21cf25610a 100644\n> --- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_vswscanf.c\n> +++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-isoc99_vswscanf.c\n> @@ -27,6 +27,8 @@ ___ieee128_isoc99_vswscanf (wchar_t *string, const wchar_t *format, va_list ap)\n> struct _IO_wide_data wd;\n> FILE *fp = _IO_strfile_readw (&sf, &wd, string);\n> int mode_flags = SCANF_ISOC99_A | SCANF_LDBL_USES_FLOAT128;\n> - return __vfwscanf_internal (fp, format, ap, mode_flags);\n> + int done = __vfwscanf_internal (fp, format, ap, mode_flags);\n> + _IO_wstrfile_fclose_stack (fp);\n> + return done;\n> }\n> strong_alias (___ieee128_isoc99_vswscanf, __isoc99_vswscanfieee128)\n> diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-swscanf.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-swscanf.c\n> index 7124ecb67c..fdfdf2b65c 100644\n> --- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-swscanf.c\n> +++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-swscanf.c\n> @@ -34,7 +34,7 @@ ___ieee128_swscanf (const wchar_t *string, const wchar_t *format, ...)\n> done = __vfwscanf_internal (fp, format, ap,\n> \t\t\t SCANF_LDBL_USES_FLOAT128);\n> va_end (ap);\n> -\n> + _IO_wstrfile_fclose_stack (fp);\n> return done;\n> }\n> strong_alias (___ieee128_swscanf, __swscanfieee128)\n> diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-vswscanf.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-vswscanf.c\n> index 8294582c48..b860a8e87d 100644\n> --- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-vswscanf.c\n> +++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-vswscanf.c\n> @@ -27,6 +27,8 @@ ___ieee128_vswscanf (const wchar_t *string, const wchar_t *format,\n> _IO_strfile sf;\n> struct _IO_wide_data wd;\n> FILE *fp = _IO_strfile_readw (&sf, &wd, string);\n> - return __vfwscanf_internal (fp, format, ap, SCANF_LDBL_USES_FLOAT128);\n> + int done = __vfwscanf_internal (fp, format, ap, SCANF_LDBL_USES_FLOAT128);\n> + _IO_wstrfile_fclose_stack (fp);\n> + return done;\n> }\n> strong_alias (___ieee128_vswscanf, __vswscanfieee128)\n> diff --git a/sysdeps/ieee754/ldbl-opt/nldbl-compat.c b/sysdeps/ieee754/ldbl-opt/nldbl-compat.c\n> index dcd5649200..e239cd5bc5 100644\n> --- a/sysdeps/ieee754/ldbl-opt/nldbl-compat.c\n> +++ b/sysdeps/ieee754/ldbl-opt/nldbl-compat.c\n> @@ -391,7 +391,9 @@ __nldbl_vswscanf (const wchar_t *s, const wchar_t *fmt, va_list ap)\n> struct _IO_wide_data wd;\n> FILE *f = _IO_strfile_readw (&sf, &wd, s);\n> \n> - return __vfwscanf_internal (f, fmt, ap, SCANF_LDBL_IS_DBL);\n> + int ret = __vfwscanf_internal (f, fmt, ap, SCANF_LDBL_IS_DBL);\n> + _IO_wstrfile_fclose_stack (f);\n> + return ret;\n> }\n> libc_hidden_def (__nldbl_vswscanf)\n> \n> @@ -955,7 +957,9 @@ __nldbl___isoc99_vswscanf (const wchar_t *s, const wchar_t *fmt, va_list ap)\n> struct _IO_wide_data wd;\n> FILE *f = _IO_strfile_readw (&sf, &wd, s);\n> \n> - return __vfwscanf_internal (f, fmt, ap, SCANF_LDBL_IS_DBL | SCANF_ISOC99_A);\n> + int ret = __vfwscanf_internal (f, fmt, ap, SCANF_LDBL_IS_DBL | SCANF_ISOC99_A);\n> + _IO_wstrfile_fclose_stack (f);\n> + return ret;\n> }\n> libc_hidden_def (__nldbl___isoc99_vswscanf)\n> \n> @@ -1115,9 +1119,11 @@ __nldbl___isoc23_vswscanf (const wchar_t *s, const wchar_t *fmt, va_list ap)\n> struct _IO_wide_data wd;\n> FILE *f = _IO_strfile_readw (&sf, &wd, s);\n> \n> - return __vfwscanf_internal (f, fmt, ap,\n> + int ret = __vfwscanf_internal (f, fmt, ap,\n> \t\t\t SCANF_LDBL_IS_DBL | SCANF_ISOC99_A\n> \t\t\t | SCANF_ISOC23_BIN_CST);\n> + _IO_wstrfile_fclose_stack (f);\n> + return ret;\n> }\n> libc_hidden_def (__nldbl___isoc23_vswscanf)\n> \n> diff --git a/wcsmbs/isoc23_swscanf.c b/wcsmbs/isoc23_swscanf.c\n> index 66b5290b3c..568ab138b4 100644\n> --- a/wcsmbs/isoc23_swscanf.c\n> +++ b/wcsmbs/isoc23_swscanf.c\n> @@ -33,6 +33,6 @@ __isoc23_swscanf (const wchar_t *s, const wchar_t *format, ...)\n> done = __vfwscanf_internal (f, format, arg,\n> \t\t\t SCANF_ISOC99_A | SCANF_ISOC23_BIN_CST);\n> va_end (arg);\n> -\n> + _IO_wstrfile_fclose_stack (f);\n> return done;\n> }\n> diff --git a/wcsmbs/isoc23_vswscanf.c b/wcsmbs/isoc23_vswscanf.c\n> index d84efb9350..89b7241a7a 100644\n> --- a/wcsmbs/isoc23_vswscanf.c\n> +++ b/wcsmbs/isoc23_vswscanf.c\n> @@ -24,7 +24,9 @@ __isoc23_vswscanf (const wchar_t *string, const wchar_t *format, va_list args)\n> _IO_strfile sf;\n> struct _IO_wide_data wd;\n> FILE *f = _IO_strfile_readw (&sf, &wd, string);\n> - return __vfwscanf_internal (f, format, args,\n> + int done = __vfwscanf_internal (f, format, args,\n> \t\t\t SCANF_ISOC99_A | SCANF_ISOC23_BIN_CST);\n> + _IO_wstrfile_fclose_stack (f);\n> + return done;\n> }\n> libc_hidden_def (__isoc23_vswscanf)\n> diff --git a/wcsmbs/isoc99_swscanf.c b/wcsmbs/isoc99_swscanf.c\n> index 493fe01520..c94f19ca41 100644\n> --- a/wcsmbs/isoc99_swscanf.c\n> +++ b/wcsmbs/isoc99_swscanf.c\n> @@ -32,6 +32,6 @@ __isoc99_swscanf (const wchar_t *s, const wchar_t *format, ...)\n> va_start (arg, format);\n> done = __vfwscanf_internal (f, format, arg, SCANF_ISOC99_A);\n> va_end (arg);\n> -\n> + _IO_wstrfile_fclose_stack (f);\n> return done;\n> }\n> diff --git a/wcsmbs/isoc99_vswscanf.c b/wcsmbs/isoc99_vswscanf.c\n> index 326f7bfd24..6bc134a807 100644\n> --- a/wcsmbs/isoc99_vswscanf.c\n> +++ b/wcsmbs/isoc99_vswscanf.c\n> @@ -33,6 +33,8 @@ __isoc99_vswscanf (const wchar_t *string, const wchar_t *format, va_list args)\n> _IO_strfile sf;\n> struct _IO_wide_data wd;\n> FILE *f = _IO_strfile_readw (&sf, &wd, string);\n> - return __vfwscanf_internal (f, format, args, SCANF_ISOC99_A);\n> + int done = __vfwscanf_internal (f, format, args, SCANF_ISOC99_A);\n> + _IO_wstrfile_fclose_stack (f);\n> + return done;\n> }\n> libc_hidden_def (__isoc99_vswscanf)","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","libc-alpha@sourceware.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","libc-alpha@sourceware.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=hL77KAaE;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=2620:52:6:3111::32; helo=vm01.sourceware.org;\n envelope-from=libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org;\n receiver=patchwork.ozlabs.org)","sourceware.org;\n\tdkim=pass (2048-bit key,\n unprotected) header.d=linaro.org header.i=@linaro.org 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Thu, 30 Apr 2026 11:42:42 -0700 (PDT)","Message-ID":"","Date":"Thu, 30 Apr 2026 15:42:36 -0300","MIME-Version":"1.0","User-Agent":"Mozilla Thunderbird","Subject":"Re: [PATCH 1/2] libio: Fix gconv module reference counter overflow in\n swscanf","To":"=?utf-8?b?RnLDqWTDqXJpYyBCw6lyYXQ=?= ,\n libc-alpha@sourceware.org, dj@redhat.com, fweimer@redhat.com","References":"<20260429145934.278803-1-fberat@redhat.com>\n <20260429145934.278803-2-fberat@redhat.com>","Content-Language":"en-US","From":"Adhemerval Zanella Netto ","Organization":"Linaro","In-Reply-To":"<20260429145934.278803-2-fberat@redhat.com>","Content-Type":"text/plain; charset=UTF-8","Content-Transfer-Encoding":"8bit","X-BeenThere":"libc-alpha@sourceware.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Libc-alpha mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org"}}]