[{"id":3679646,"web_url":"http://patchwork.ozlabs.org/comment/3679646/","msgid":"","date":"2026-04-21T01:04:37","subject":"Re: [PATCH v2] powerpc/pseries/papr-hvpipe: fix NULL dereference in\n handle creation","submitter":{"id":79126,"url":"http://patchwork.ozlabs.org/api/people/79126/","name":"Ritesh Harjani (IBM)","email":"ritesh.list@gmail.com"},"content":"Guangshuo Li writes:\n\n> papr_hvpipe_dev_create_handle() transfers ownership of src_info with\n> retain_and_null_ptr(src_info) after anon_inode_getfile() succeeds.\n> However, retain_and_null_ptr() clears src_info immediately, and the\n> function then still dereferences src_info in the subsequent list_add().\n>\n> Store the transferred pointer in a separate variable and use that for\n> the list insertion.\n>\n> Manually identified during code review.\n\nThanks. Although the fix for this and bunch of other fixes & cleanups\nwere already queued up for review in here [1].\n\n[1]: https://lore.kernel.org/all/cover.1775648406.git.ritesh.list@gmail.com/\n\n-ritesh","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=JZVPORbL;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-19855-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org;\n arc=none smtp.remote-ip=\"2607:f8b0:4864:20::530\"","lists.ozlabs.org;\n dmarc=pass (p=none dis=none) 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,\n Michael Ellerman , Nicholas Piggin ,\n \"Christophe Leroy (CS GROUP)\" ,\n Mahesh Salgaonkar , Haren Myneni ,\n Tyrel Datwyler ,\n Christian Brauner , Kees Cook ,\n Guangshuo Li , linuxppc-dev@lists.ozlabs.org,\n linux-kernel@vger.kernel.org","Cc":"stable@vger.kernel.org","Subject":"Re: [PATCH v2] powerpc/pseries/papr-hvpipe: fix NULL dereference in\n handle creation","In-Reply-To":"<20260420132429.128075-1-lgs201920130244@gmail.com>","Date":"Tue, 21 Apr 2026 06:34:37 +0530","Message-ID":"","References":"<20260420132429.128075-1-lgs201920130244@gmail.com>","X-Spam-Status":"No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,\n\tSPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list"}},{"id":3680326,"web_url":"http://patchwork.ozlabs.org/comment/3680326/","msgid":"<202604221653.KzDQsCY8-lkp@intel.com>","date":"2026-04-22T08:54:41","subject":"Re: [PATCH v2] powerpc/pseries/papr-hvpipe: fix NULL dereference in\n handle creation","submitter":{"id":67315,"url":"http://patchwork.ozlabs.org/api/people/67315/","name":"kernel test robot","email":"lkp@intel.com"},"content":"Hi Guangshuo,\n\nkernel test robot noticed the following build errors:\n\n[auto build test ERROR on powerpc/next]\n[also build test ERROR on powerpc/fixes linus/master v7.0 next-20260421]\n[If your patch is applied to the wrong git tree, kindly drop us a note.\nAnd when submitting patch, we suggest to use '--base' as documented in\nhttps://git-scm.com/docs/git-format-patch#_base_tree_information]\n\nurl: https://github.com/intel-lab-lkp/linux/commits/Guangshuo-Li/powerpc-pseries-papr-hvpipe-fix-NULL-dereference-in-handle-creation/20260420-224327\nbase: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next\npatch link: https://lore.kernel.org/r/20260420132429.128075-1-lgs201920130244%40gmail.com\npatch subject: [PATCH v2] powerpc/pseries/papr-hvpipe: fix NULL dereference in handle creation\nconfig: powerpc-allmodconfig (https://download.01.org/0day-ci/archive/20260422/202604221653.KzDQsCY8-lkp@intel.com/config)\ncompiler: powerpc64-linux-gcc (GCC) 15.2.0\nreproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260422/202604221653.KzDQsCY8-lkp@intel.com/reproduce)\n\nIf you fix the issue in a separate patch/commit (i.e. not just a new version of\nthe same patch/commit), kindly add following tags\n| Reported-by: kernel test robot \n| Closes: https://lore.kernel.org/oe-kbuild-all/202604221653.KzDQsCY8-lkp@intel.com/\n\nAll errors (new ones prefixed by >>):\n\n arch/powerpc/platforms/pseries/papr-hvpipe.c: In function 'papr_hvpipe_dev_create_handle':\n>> arch/powerpc/platforms/pseries/papr-hvpipe.c:513:24: error: invalid use of void expression\n 513 | owned_src_info = retain_and_null_ptr(src_info);\n | ^\n\n\nvim +513 arch/powerpc/platforms/pseries/papr-hvpipe.c\n\n 479\t\n 480\tstatic int papr_hvpipe_dev_create_handle(u32 srcID)\n 481\t{\n 482\t\tstruct hvpipe_source_info *src_info __free(kfree) = NULL;\n 483\t\tstruct hvpipe_source_info *owned_src_info;\n 484\t\n 485\t\tspin_lock(&hvpipe_src_list_lock);\n 486\t\t/*\n 487\t\t * Do not allow more than one process communicates with\n 488\t\t * each source.\n 489\t\t */\n 490\t\tsrc_info = hvpipe_find_source(srcID);\n 491\t\tif (src_info) {\n 492\t\t\tspin_unlock(&hvpipe_src_list_lock);\n 493\t\t\tpr_err(\"pid(%d) is already using the source(%d)\\n\",\n 494\t\t\t\t\tsrc_info->tsk->pid, srcID);\n 495\t\t\treturn -EALREADY;\n 496\t\t}\n 497\t\tspin_unlock(&hvpipe_src_list_lock);\n 498\t\n 499\t\tsrc_info = kzalloc_obj(*src_info, GFP_KERNEL_ACCOUNT);\n 500\t\tif (!src_info)\n 501\t\t\treturn -ENOMEM;\n 502\t\n 503\t\tsrc_info->srcID = srcID;\n 504\t\tsrc_info->tsk = current;\n 505\t\tinit_waitqueue_head(&src_info->recv_wqh);\n 506\t\n 507\t\tFD_PREPARE(fdf, O_RDONLY | O_CLOEXEC,\n 508\t\t\t anon_inode_getfile(\"[papr-hvpipe]\", &papr_hvpipe_handle_ops,\n 509\t\t\t\t\t (void *)src_info, O_RDWR));\n 510\t\tif (fdf.err)\n 511\t\t\treturn fdf.err;\n 512\t\n > 513\t\towned_src_info = retain_and_null_ptr(src_info);\n 514\t\tspin_lock(&hvpipe_src_list_lock);\n 515\t\t/*\n 516\t\t * If two processes are executing ioctl() for the same\n 517\t\t * source ID concurrently, prevent the second process to\n 518\t\t * acquire FD.\n 519\t\t */\n 520\t\tif (hvpipe_find_source(srcID)) {\n 521\t\t\tspin_unlock(&hvpipe_src_list_lock);\n 522\t\t\treturn -EALREADY;\n 523\t\t}\n 524\t\tlist_add(&owned_src_info->list, &hvpipe_src_list);\n 525\t\tspin_unlock(&hvpipe_src_list_lock);\n 526\t\treturn fd_publish(fdf);\n 527\t}\n 528","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel header.b=iRf9ynAx;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-19943-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org;\n arc=none smtp.remote-ip=192.198.163.18","lists.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=intel.com","lists.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel 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d=\"scan'208\";a=\"232204588\""],"X-ExtLoop1":"1","Date":"Wed, 22 Apr 2026 16:54:41 +0800","From":"kernel test robot ","To":"Guangshuo Li ,\n\tMadhavan Srinivasan ,\n\tMichael Ellerman ,\n\tNicholas Piggin ,\n\t\"Christophe Leroy (CS GROUP)\" ,\n\tMahesh Salgaonkar ,\n\tHaren Myneni ,\n\tTyrel Datwyler ,\n\tChristian Brauner , Kees Cook ,\n\tlinuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org","Cc":"oe-kbuild-all@lists.linux.dev, stable@vger.kernel.org","Subject":"Re: [PATCH v2] powerpc/pseries/papr-hvpipe: fix NULL dereference in\n handle creation","Message-ID":"<202604221653.KzDQsCY8-lkp@intel.com>","References":"<20260420132429.128075-1-lgs201920130244@gmail.com>","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","Content-Type":"text/plain; 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