| commit | d7dce9e08595e80bf8039a81794809c66fe26431 | [log] [tgz] |
|---|---|---|
| author | yangerkun <yangerkun@huawei.com> | Wed Oct 28 13:56:17 2020 +0800 |
| committer | Theodore Ts'o <tytso@mit.edu> | Wed Oct 28 13:43:13 2020 -0400 |
| tree | 4f7d7c6bacdd04699ec030081195d84feacc0506 | |
| parent | 8c9be1e58a8dc03ef815ca51ece95c5e6862b25e [diff] |
ext4: do not use extent after put_bh ext4_ext_search_right() will read more extent blocks and call put_bh after we get the information we need. However, ret_ex will break this and may cause use-after-free once pagecache has been freed. Fix it by copying the extent structure if needed. Signed-off-by: yangerkun <yangerkun@huawei.com> Link: https://lore.kernel.org/r/20201028055617.2569255-1-yangerkun@huawei.com Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org