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CVE PROGRAM SOURCE RECORDUnscored

CVE-2023-53468

ubifs: Fix memory leak in alloc_wbufs()

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d to < 1f206002c6bc302bface871ef3f72c0bbcaa931caffected
  • 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d to < bf50229494f0443b3f08427d7df63e5a7e2a796aaffected
  • 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d to < 3e29634eb56e6547272fe4e568f63421f8b3b9faaffected
  • 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d to < 26ec45f1c504e15268383019df139d7983f1e67faffected
  • 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d to < e11f36d3bc4d23f620754a948fe7b82b63dcb185affected
  • 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d to < 4a1ff3c5d04b9079b4f768d9a71b51c4af578dd2affected

Linux Linux

Default version status: affected

  • 2.6.27affected
  • 0 to < 2.6.27unaffected
  • 5.4.235 to ≤ 5.4.*unaffected
  • 5.10.173 to ≤ 5.10.*unaffected
  • 5.15.100 to ≤ 5.15.*unaffected
  • 6.1.18 to ≤ 6.1.*unaffected
  • 6.2.5 to ≤ 6.2.*unaffected
  • 6.3 to ≤ *unaffected

References