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authorSage Weil <sage@newdream.net>2010-11-22 22:58:06 -0800
committerSage Weil <sage@newdream.net>2010-12-01 14:15:31 -0800
commit884ea892763d4dfba509743f65961c782c0442db (patch)
tree92a7f5b67aa06cf32457ccb2b69c28c528a48c15 /fs/ceph
parent3561d43fd289f590fdae672e5eb831b8d5cf0bf6 (diff)
ceph: avoid possible null deref in readdir after dir llseek
last may be NULL, but we dereference it in the else branch without checking. Normally it doesn't trigger because last == NULL when fpos == 2, but it could happen on a newly opened dir if the user seeks forward. Reported-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/dir.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 7d447af84ec4..158c700fdca5 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -114,8 +114,8 @@ static int __dcache_readdir(struct file *filp,
spin_lock(&dcache_lock);
/* start at beginning? */
- if (filp->f_pos == 2 || (last &&
- filp->f_pos < ceph_dentry(last)->offset)) {
+ if (filp->f_pos == 2 || last == NULL ||
+ filp->f_pos < ceph_dentry(last)->offset) {
if (list_empty(&parent->d_subdirs))
goto out_unlock;
p = parent->d_subdirs.prev;