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| author | Sahitya Tummala <stummala@codeaurora.org> | 2019-05-11 04:00:33 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2019-05-11 04:00:33 +0200 |
| commit | 08fc98a4d6424af66eb3ac4e2cedd2fc927ed436 (patch) | |
| tree | 0868ad014fc042281419f981e93c5e40050d1cf7 /security | |
| parent | ext4: fix data corruption caused by overlapping unaligned and aligned IO (diff) | |
| download | linux-08fc98a4d6424af66eb3ac4e2cedd2fc927ed436.tar.xz linux-08fc98a4d6424af66eb3ac4e2cedd2fc927ed436.zip | |
ext4: fix use-after-free in dx_release()
The buffer_head (frames[0].bh) and it's corresping page can be
potentially free'd once brelse() is done inside the for loop
but before the for loop exits in dx_release(). It can be free'd
in another context, when the page cache is flushed via
drop_caches_sysctl_handler(). This results into below data abort
when accessing info->indirect_levels in dx_release().
Unable to handle kernel paging request at virtual address ffffffc17ac3e01e
Call trace:
dx_release+0x70/0x90
ext4_htree_fill_tree+0x2d4/0x300
ext4_readdir+0x244/0x6f8
iterate_dir+0xbc/0x160
SyS_getdents64+0x94/0x174
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Cc: stable@kernel.org
Diffstat (limited to 'security')
0 files changed, 0 insertions, 0 deletions