diff options
| author | Pan Bian <[email protected]> | 2018-11-30 14:10:54 -0800 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2018-11-30 14:56:15 -0800 |
| commit | 164f7e586739d07eb56af6f6d66acebb11f315c8 (patch) | |
| tree | a49af6943dcf92e4616bfbb6aac9b061e548d776 | |
| parent | 95feeabb77149f7d48f05bde61d75621c57db67e (diff) | |
ocfs2: fix potential use after free
ocfs2_get_dentry() calls iput(inode) to drop the reference count of
inode, and if the reference count hits 0, inode is freed. However, in
this function, it then reads inode->i_generation, which may result in a
use after free bug. Move the put operation later.
Link: http://lkml.kernel.org/r/[email protected]
Fixes: 781f200cb7a("ocfs2: Remove masklog ML_EXPORT.")
Signed-off-by: Pan Bian <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Cc: Mark Fasheh <[email protected]>
Cc: Joel Becker <[email protected]>
Cc: Junxiao Bi <[email protected]>
Cc: Joseph Qi <[email protected]>
Cc: Changwei Ge <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | fs/ocfs2/export.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ocfs2/export.c b/fs/ocfs2/export.c index 9f88188060db..4bf8d5854b27 100644 --- a/fs/ocfs2/export.c +++ b/fs/ocfs2/export.c @@ -125,10 +125,10 @@ check_err: check_gen: if (handle->ih_generation != inode->i_generation) { - iput(inode); trace_ocfs2_get_dentry_generation((unsigned long long)blkno, handle->ih_generation, inode->i_generation); + iput(inode); result = ERR_PTR(-ESTALE); goto bail; } |