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authorAl Viro <viro@www.linux.org.uk>2005-06-06 13:36:08 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-06 14:42:26 -0700
commitba7a4c1a76f56c607560f1676680ff491747bdae (patch)
treec68f4fd0d5802819eb16dc6c126b2c24f4e09634
parenta15a3f6fc67d910f43098acec6e19d25a37d7cb9 (diff)
[PATCH] namei fixes (13/19)
In open_namei() exit_dput: we have mntput() done in the wrong order - if nd->mnt != path.mnt we end up doing mntput(nd->mnt); nd->mnt = path.mnt; dput(nd->dentry); mntput(nd->mnt); which drops nd->dentry too late. Fixed by having path.mnt go first. That allows to switch O_NOFOLLOW under if (__follow_mount(...)) back to exit_dput, while we are at it. Fix for early-mntput() race + equivalent transformation. Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--fs/namei.c10
1 files changed, 3 insertions, 7 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 37fcf941fa3..5153f57ee6b 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1501,11 +1501,8 @@ do_last:
if (__follow_mount(&path)) {
error = -ELOOP;
- if (flag & O_NOFOLLOW) {
- dput(path.dentry);
- mntput(path.mnt);
- goto exit;
- }
+ if (flag & O_NOFOLLOW)
+ goto exit_dput;
}
error = -ENOENT;
if (!path.dentry->d_inode)
@@ -1530,8 +1527,7 @@ ok:
exit_dput:
dput(path.dentry);
if (nd->mnt != path.mnt)
- mntput(nd->mnt);
- nd->mnt = path.mnt;
+ mntput(path.mnt);
exit:
path_release(nd);
return error;