Description
In the Linux kernel, the following vulnerability has been resolved: ubifs: Fix memory leak in alloc_wbufs() kmemleak reported a sequence of memory leaks, and show them as following: unreferenced object 0xffff8881575f8400 (size 1024): comm "mount", pid 19625, jiffies 4297119604 (age 20.383s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff8176cecd>] __kmalloc+0x4d/0x150 [<ffffffffa0406b2b>] ubifs_mount+0x307b/0x7170 [ubifs] [<ffffffff819fa8fd>] legacy_get_tree+0xed/0x1d0 [<ffffffff81936f2d>] vfs_get_tree+0x7d/0x230 [<ffffffff819b2bd4>] path_mount+0xdd4/0x17b0 [<ffffffff819b37aa>] __x64_sys_mount+0x1fa/0x270 [<ffffffff83c14295>] do_syscall_64+0x35/0x80 [<ffffffff83e0006a>] entry_SYSCALL_64_after_hwframe+0x46/0xb0 unreferenced object 0xffff8881798a6e00 (size 512): comm "mount", pid 19677, jiffies 4297121912 (age 37.816s) hex dump (first 32 bytes): 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk backtrace: [<ffffffff8176cecd>] __kmalloc+0x4d/0x150 [<ffffffffa0418342>] ubifs_wbuf_init+0x52/0x480 [ubifs] [<ffffffffa0406ca5>] ubifs_mount+0x31f5/0x7170 [ubifs] [<ffffffff819fa8fd>] legacy_get_tree+0xed/0x1d0 [<ffffffff81936f2d>] vfs_get_tree+0x7d/0x230 [<ffffffff819b2bd4>] path_mount+0xdd4/0x17b0 [<ffffffff819b37aa>] __x64_sys_mount+0x1fa/0x270 [<ffffffff83c14295>] do_syscall_64+0x35/0x80 [<ffffffff83e0006a>] entry_SYSCALL_64_after_hwframe+0x46/0xb0 The problem is that the ubifs_wbuf_init() returns an error in the loop which in the alloc_wbufs(), then the wbuf->buf and wbuf->inodes that were successfully alloced before are not freed. Fix it by adding error hanging path in alloc_wbufs() which frees the memory alloced before when ubifs_wbuf_init() returns an error.
Product status
1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d before 1f206002c6bc302bface871ef3f72c0bbcaa931c
1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d before bf50229494f0443b3f08427d7df63e5a7e2a796a
1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d before 3e29634eb56e6547272fe4e568f63421f8b3b9fa
1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d before 26ec45f1c504e15268383019df139d7983f1e67f
1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d before e11f36d3bc4d23f620754a948fe7b82b63dcb185
1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d before 4a1ff3c5d04b9079b4f768d9a71b51c4af578dd2
2.6.27
Any version before 2.6.27
5.4.235
5.10.173
5.15.100
6.1.18
6.2.5
6.3
References
git.kernel.org/...c/1f206002c6bc302bface871ef3f72c0bbcaa931c
git.kernel.org/...c/bf50229494f0443b3f08427d7df63e5a7e2a796a
git.kernel.org/...c/3e29634eb56e6547272fe4e568f63421f8b3b9fa
git.kernel.org/...c/26ec45f1c504e15268383019df139d7983f1e67f
git.kernel.org/...c/e11f36d3bc4d23f620754a948fe7b82b63dcb185
git.kernel.org/...c/4a1ff3c5d04b9079b4f768d9a71b51c4af578dd2
