From: "Mårten Lindahl" <marten.lindahl@axis.com> To: Richard Weinberger <richard@nod.at> Cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, kernel@axis.com, "Mårten Lindahl" <marten.lindahl@axis.com> Subject: [PATCH] ubifs: Free memory for tmpfile name Date: Wed, 29 Mar 2023 15:26:53 +0200 [thread overview] Message-ID: <20230329-memleak-fix-v1-1-7133da56ea8f@axis.com> (raw) When opening a ubifs tmpfile on an encrypted directory, function fscrypt_setup_filename allocates memory for the name that is to be stored in the directory entry, but after the name has been copied to the directory entry inode, the memory is not freed. When running kmemleak on it we see that it is registered as a leak. The report below is triggered by a simple program 'tmpfile' just opening a tmpfile: unreferenced object 0xffff88810178f380 (size 32): comm "tmpfile", pid 509, jiffies 4294934744 (age 1524.742s) backtrace: __kmem_cache_alloc_node __kmalloc fscrypt_setup_filename ubifs_tmpfile vfs_tmpfile path_openat Free this memory after it has been copied to the inode. Signed-off-by: Mårten Lindahl <marten.lindahl@axis.com> --- fs/ubifs/dir.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c index 0f29cf201136..089ca6910124 100644 --- a/fs/ubifs/dir.c +++ b/fs/ubifs/dir.c @@ -491,6 +491,7 @@ static int ubifs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, goto out_cancel; unlock_2_inodes(dir, inode); + fscrypt_free_filename(&nm); ubifs_release_budget(c, &req); return finish_open_simple(file, 0); --- base-commit: c9c3395d5e3dcc6daee66c6908354d47bf98cb0c change-id: 20230329-memleak-fix-87a01daf469e Best regards, -- Mårten Lindahl <marten.lindahl@axis.com>
WARNING: multiple messages have this Message-ID (diff)
From: "Mårten Lindahl" <marten.lindahl@axis.com> To: Richard Weinberger <richard@nod.at> Cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, kernel@axis.com, "Mårten Lindahl" <marten.lindahl@axis.com> Subject: [PATCH] ubifs: Free memory for tmpfile name Date: Wed, 29 Mar 2023 15:26:53 +0200 [thread overview] Message-ID: <20230329-memleak-fix-v1-1-7133da56ea8f@axis.com> (raw) When opening a ubifs tmpfile on an encrypted directory, function fscrypt_setup_filename allocates memory for the name that is to be stored in the directory entry, but after the name has been copied to the directory entry inode, the memory is not freed. When running kmemleak on it we see that it is registered as a leak. The report below is triggered by a simple program 'tmpfile' just opening a tmpfile: unreferenced object 0xffff88810178f380 (size 32): comm "tmpfile", pid 509, jiffies 4294934744 (age 1524.742s) backtrace: __kmem_cache_alloc_node __kmalloc fscrypt_setup_filename ubifs_tmpfile vfs_tmpfile path_openat Free this memory after it has been copied to the inode. Signed-off-by: Mårten Lindahl <marten.lindahl@axis.com> --- fs/ubifs/dir.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c index 0f29cf201136..089ca6910124 100644 --- a/fs/ubifs/dir.c +++ b/fs/ubifs/dir.c @@ -491,6 +491,7 @@ static int ubifs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, goto out_cancel; unlock_2_inodes(dir, inode); + fscrypt_free_filename(&nm); ubifs_release_budget(c, &req); return finish_open_simple(file, 0); --- base-commit: c9c3395d5e3dcc6daee66c6908354d47bf98cb0c change-id: 20230329-memleak-fix-87a01daf469e Best regards, -- Mårten Lindahl <marten.lindahl@axis.com> ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/
next reply other threads:[~2023-03-29 13:27 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-03-29 13:26 Mårten Lindahl [this message] 2023-03-29 13:26 ` [PATCH] ubifs: Free memory for tmpfile name Mårten Lindahl 2023-03-30 2:25 ` Zhihao Cheng 2023-03-30 2:25 ` Zhihao Cheng 2023-03-30 7:54 ` Mårten Lindahl 2023-03-30 7:54 ` Mårten Lindahl 2023-03-30 8:21 ` Zhihao Cheng 2023-03-30 8:21 ` Zhihao Cheng
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