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| author | Al Viro <viro@ZenIV.linux.org.uk> | 2014-09-12 23:56:04 +0400 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2014-09-12 23:58:55 +0400 |
| commit | cfb2f9d5c921e38b0f12bb26fed10b877664444d (patch) | |
| tree | c48f758a0b66ec32d15e4ff5a42334a72889a1b5 /fs/gfs2/inode.c | |
| parent | a937cca270c544c4319572b57b196b2251b07dd2 (diff) | |
| download | linux-cfb2f9d5c921e38b0f12bb26fed10b877664444d.tar.xz | |
GFS2: fix d_splice_alias() misuses
Callers of d_splice_alias(dentry, inode) don't need iput(), neither
on success nor on failure. Either the reference to inode is stored
in a previously negative dentry, or it's dropped. In either case
inode reference the caller used to hold is consumed.
__gfs2_lookup() does iput() in case when d_splice_alias() has failed.
Double iput() if we ever hit that. And gfs2_create_inode() ends up
not only with double iput(), but with link count dropped to zero - on
an inode it has just found in directory.
Cc: stable@vger.kernel.org # v3.14+
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/inode.c')
| -rw-r--r-- | fs/gfs2/inode.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c index 9317ddc1b3c3..fc8ac2ee0667 100644 --- a/fs/gfs2/inode.c +++ b/fs/gfs2/inode.c @@ -626,8 +626,10 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, if (!IS_ERR(inode)) { d = d_splice_alias(inode, dentry); error = PTR_ERR(d); - if (IS_ERR(d)) + if (IS_ERR(d)) { + inode = ERR_CAST(d); goto fail_gunlock; + } error = 0; if (file) { if (S_ISREG(inode->i_mode)) { @@ -856,7 +858,6 @@ static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, d = d_splice_alias(inode, dentry); if (IS_ERR(d)) { - iput(inode); gfs2_glock_dq_uninit(&gh); return d; } |