[{"id":3677912,"web_url":"http://patchwork.ozlabs.org/comment/3677912/","msgid":"<26c9c959-a3b6-e1de-1215-887990a46870@huawei.com>","list_archive_url":null,"date":"2026-04-16T03:22:49","subject":"Re: [PATCH v1] mtd: ubi: fix kref leak on -EBUSY return in\n ubi_detach_mtd_dev()","submitter":{"id":76854,"url":"http://patchwork.ozlabs.org/api/people/76854/","name":"Zhihao Cheng","email":"chengzhihao1@huawei.com"},"content":"在 2026/4/16 9:11, Yuho Choi 写道:\n> ubi_detach_mtd_dev() calls ubi_get_device() which increments both\n> ubi->ref_count and the device kref via get_device(). When the device\n> is busy and anyway==0, the function returns -EBUSY after releasing\n> ubi_devices_lock, but never calls put_device() to drop the kref\n> acquired by ubi_get_device(). This leaks the kref, preventing the\n> device from ever being freed.\n> \n> Commit 7e84c961b2eb (\"mtd: ubi: introduce pre-removal notification\n> for UBI volumes\") moved put_device() to after ubi->is_dead = true\n> to pair it with the notify+nullify sequence, but inadvertently left\n> the early -EBUSY return without a matching put_device().\n> \n> Add put_device(&ubi->dev) before returning -EBUSY to balance the\n> get_device() inside ubi_get_device().\n> \n> Fixes: 7e84c961b2eb (\"mtd: ubi: introduce pre-removal notification for UBI volumes\")\n> Signed-off-by: Yuho Choi \n> ---\n> drivers/mtd/ubi/build.c | 1 +\n> 1 file changed, 1 insertion(+)\n\nReviewed-by: Zhihao Cheng \n> \n> diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c\n> index 674ad87809df0..d81f5e0395ac0 100644\n> --- a/drivers/mtd/ubi/build.c\n> +++ b/drivers/mtd/ubi/build.c\n> @@ -1106,6 +1106,7 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)\n> \tif (ubi->ref_count) {\n> \t\tif (!anyway) {\n> \t\t\tspin_unlock(&ubi_devices_lock);\n> +\t\t\tput_device(&ubi->dev);\n> \t\t\treturn -EBUSY;\n> \t\t}\n> \t\t/* This may only happen if there is a bug */\n>","headers":{"Return-Path":"\n ","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=bGrHC678;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=huawei.com header.i=@huawei.com header.a=rsa-sha256\n header.s=dkim header.b=j3MbQ2nE;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=temperror (SPF Temporary Error: DNS Timeout)\n smtp.mailfrom=lists.infradead.org (client-ip=2607:7c80:54:3::133;\n helo=bombadil.infradead.org;\n envelope-from=linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from bombadil.infradead.org (bombadil.infradead.org\n [IPv6:2607:7c80:54:3::133])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fx3Lq6ywXz1yCv\n\tfor ; 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charset=\"gbk\"; Format=\"flowed\"","Sender":"\"linux-mtd\" ","Errors-To":"linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org"}},{"id":3677918,"web_url":"http://patchwork.ozlabs.org/comment/3677918/","msgid":"","list_archive_url":null,"date":"2026-04-16T03:34:51","subject":"Re: [PATCH v1] mtd: ubi: fix kref leak on -EBUSY return in\n ubi_detach_mtd_dev()","submitter":{"id":93165,"url":"http://patchwork.ozlabs.org/api/people/93165/","name":"최유호","email":"dbgh9129@gmail.com"},"content":"Dear Zhihao,\n\nThank you for the review. I appreciate your feedback on this fix.\n\nBest regards,\nYuho\n\nOn Wed, 15 Apr 2026 at 23:22, Zhihao Cheng wrote:\n>\n> 在 2026/4/16 9:11, Yuho Choi 写道:\n> > ubi_detach_mtd_dev() calls ubi_get_device() which increments both\n> > ubi->ref_count and the device kref via get_device(). When the device\n> > is busy and anyway==0, the function returns -EBUSY after releasing\n> > ubi_devices_lock, but never calls put_device() to drop the kref\n> > acquired by ubi_get_device(). This leaks the kref, preventing the\n> > device from ever being freed.\n> >\n> > Commit 7e84c961b2eb (\"mtd: ubi: introduce pre-removal notification\n> > for UBI volumes\") moved put_device() to after ubi->is_dead = true\n> > to pair it with the notify+nullify sequence, but inadvertently left\n> > the early -EBUSY return without a matching put_device().\n> >\n> > Add put_device(&ubi->dev) before returning -EBUSY to balance the\n> > get_device() inside ubi_get_device().\n> >\n> > Fixes: 7e84c961b2eb (\"mtd: ubi: introduce pre-removal notification for UBI volumes\")\n> > Signed-off-by: Yuho Choi \n> > ---\n> > drivers/mtd/ubi/build.c | 1 +\n> > 1 file changed, 1 insertion(+)\n>\n> Reviewed-by: Zhihao Cheng \n> >\n> > diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c\n> > index 674ad87809df0..d81f5e0395ac0 100644\n> > --- a/drivers/mtd/ubi/build.c\n> > +++ b/drivers/mtd/ubi/build.c\n> > @@ -1106,6 +1106,7 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)\n> > if (ubi->ref_count) {\n> > if (!anyway) {\n> > spin_unlock(&ubi_devices_lock);\n> > + put_device(&ubi->dev);\n> > return -EBUSY;\n> > }\n> > /* This may only happen if there is a bug */\n> >\n>","headers":{"Return-Path":"\n ","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=f+fLMGZN;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=HhOWQSEx;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=none (no SPF record) smtp.mailfrom=lists.infradead.org\n (client-ip=2607:7c80:54:3::133; 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Wed, 15 Apr 2026\n 20:35:02 -0700 (PDT)","MIME-Version":"1.0","References":"<20260416011128.45754-1-dbgh9129@gmail.com>\n <26c9c959-a3b6-e1de-1215-887990a46870@huawei.com>","In-Reply-To":"<26c9c959-a3b6-e1de-1215-887990a46870@huawei.com>","From":"=?utf-8?b?7LWc7Jyg7Zi4?= ","Date":"Wed, 15 Apr 2026 23:34:51 -0400","X-Gm-Features":"AQROBzC3cH7QOw0XNn3Tam6Xdzuf1sJAOxu1FHayVi7Q9MEIADp44N6_Uo_53J8","Message-ID":"\n ","Subject":"Re: [PATCH v1] mtd: ubi: fix kref leak on -EBUSY return in\n ubi_detach_mtd_dev()","To":"Zhihao Cheng ","Cc":"Richard Weinberger ,\n Miquel Raynal ,\n\tVignesh Raghavendra , linux-mtd@lists.infradead.org,\n\tlinux-kernel@vger.kernel.org, \"Kim, Taegyu\" ","X-CRM114-Version":"20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ","X-CRM114-CacheID":"sfid-20260415_203504_992649_91796E82 ","X-CRM114-Status":"GOOD ( 19.83 )","X-Spam-Score":"-1.8 (-)","X-Spam-Report":"Spam detection software,\n running on the system \"bombadil.infradead.org\",\n has NOT identified this incoming email as spam. The original\n message has been attached to this so you can view it or label\n similar future email. If you have any questions, see\n the administrator of that system for details.\n Content preview: Dear Zhihao,\n Thank you for the review. I appreciate your feedback\n on this fix. 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