| Message ID | 1320866531-9911-1-git-send-email-peter.maydell@linaro.org |
|---|---|
| State | New |
| Headers | show |
On 11/09/2011 01:22 PM, Peter Maydell wrote: > If a malloc() in copy_elf_strings() failed we would call memset() > before the "did malloc fail?" check. Fix this by moving to the > glib alloc/free routines for this memory so we can use g_try_malloc0 > rather than having a separate memset(). Spotted by Coverity (see > bug 887883). > > Signed-off-by: Peter Maydell<peter.maydell@linaro.org> Applied. Thanks. Regards, Anthony Liguori > --- > We could obviously also fix this by just moving the memset after the > null check, but I think we want to move towards consistently using > the glib memory routines everywhere anyway. > > linux-user/elfload.c | 5 ++--- > linux-user/linuxload.c | 2 +- > 2 files changed, 3 insertions(+), 4 deletions(-) > > diff --git a/linux-user/elfload.c b/linux-user/elfload.c > index a413976..4635bb2 100644 > --- a/linux-user/elfload.c > +++ b/linux-user/elfload.c > @@ -1105,8 +1105,7 @@ static abi_ulong copy_elf_strings(int argc,char ** argv, void **page, > offset = p % TARGET_PAGE_SIZE; > pag = (char *)page[p/TARGET_PAGE_SIZE]; > if (!pag) { > - pag = (char *)malloc(TARGET_PAGE_SIZE); > - memset(pag, 0, TARGET_PAGE_SIZE); > + pag = g_try_malloc0(TARGET_PAGE_SIZE); > page[p/TARGET_PAGE_SIZE] = pag; > if (!pag) > return 0; > @@ -1164,7 +1163,7 @@ static abi_ulong setup_arg_pages(abi_ulong p, struct linux_binprm *bprm, > info->rss++; > /* FIXME - check return value of memcpy_to_target() for failure */ > memcpy_to_target(stack_base, bprm->page[i], TARGET_PAGE_SIZE); > - free(bprm->page[i]); > + g_free(bprm->page[i]); > } > stack_base += TARGET_PAGE_SIZE; > } > diff --git a/linux-user/linuxload.c b/linux-user/linuxload.c > index 62ebc7e..b47025f 100644 > --- a/linux-user/linuxload.c > +++ b/linux-user/linuxload.c > @@ -178,7 +178,7 @@ int loader_exec(const char * filename, char ** argv, char ** envp, > > /* Something went wrong, return the inode and free the argument pages*/ > for (i=0 ; i<MAX_ARG_PAGES ; i++) { > - free(bprm->page[i]); > + g_free(bprm->page[i]); > } > return(retval); > }
diff --git a/linux-user/elfload.c b/linux-user/elfload.c index a413976..4635bb2 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -1105,8 +1105,7 @@ static abi_ulong copy_elf_strings(int argc,char ** argv, void **page, offset = p % TARGET_PAGE_SIZE; pag = (char *)page[p/TARGET_PAGE_SIZE]; if (!pag) { - pag = (char *)malloc(TARGET_PAGE_SIZE); - memset(pag, 0, TARGET_PAGE_SIZE); + pag = g_try_malloc0(TARGET_PAGE_SIZE); page[p/TARGET_PAGE_SIZE] = pag; if (!pag) return 0; @@ -1164,7 +1163,7 @@ static abi_ulong setup_arg_pages(abi_ulong p, struct linux_binprm *bprm, info->rss++; /* FIXME - check return value of memcpy_to_target() for failure */ memcpy_to_target(stack_base, bprm->page[i], TARGET_PAGE_SIZE); - free(bprm->page[i]); + g_free(bprm->page[i]); } stack_base += TARGET_PAGE_SIZE; } diff --git a/linux-user/linuxload.c b/linux-user/linuxload.c index 62ebc7e..b47025f 100644 --- a/linux-user/linuxload.c +++ b/linux-user/linuxload.c @@ -178,7 +178,7 @@ int loader_exec(const char * filename, char ** argv, char ** envp, /* Something went wrong, return the inode and free the argument pages*/ for (i=0 ; i<MAX_ARG_PAGES ; i++) { - free(bprm->page[i]); + g_free(bprm->page[i]); } return(retval); }
If a malloc() in copy_elf_strings() failed we would call memset() before the "did malloc fail?" check. Fix this by moving to the glib alloc/free routines for this memory so we can use g_try_malloc0 rather than having a separate memset(). Spotted by Coverity (see bug 887883). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> --- We could obviously also fix this by just moving the memset after the null check, but I think we want to move towards consistently using the glib memory routines everywhere anyway. linux-user/elfload.c | 5 ++--- linux-user/linuxload.c | 2 +- 2 files changed, 3 insertions(+), 4 deletions(-)