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authorPan Bian <bianpan2016@163.com>2018-11-30 14:10:54 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-11-30 14:56:15 -0800
commit164f7e586739d07eb56af6f6d66acebb11f315c8 (patch)
treea49af6943dcf92e4616bfbb6aac9b061e548d776
parent95feeabb77149f7d48f05bde61d75621c57db67e (diff)
downloadlinux-164f7e586739d07eb56af6f6d66acebb11f315c8.tar.bz2
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/1543109237-110227-1-git-send-email-bianpan2016@163.com Fixes: 781f200cb7a("ocfs2: Remove masklog ML_EXPORT.") Signed-off-by: Pan Bian <bianpan2016@163.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Mark Fasheh <mark@fasheh.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Joseph Qi <jiangqi903@gmail.com> Cc: Changwei Ge <ge.changwei@h3c.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/ocfs2/export.c2
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;
}