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authorSage Weil <sage@newdream.net>2011-01-13 15:27:29 -0800
committerSage Weil <sage@newdream.net>2011-01-13 15:50:11 -0800
commit17db143fc091238c43ab9f373974ca2224a4c3f8 (patch)
treed72df7c0d88e6e9176292a560e9e9fcac12848aa /fs/ceph/xattr.c
parent1c1266bb916e6a6b362d3be95f2cc7f3c41277a6 (diff)
ceph: fix xattr rbtree search
Fix xattr name comparison in rbtree search for strings that share a prefix. The *name argument is null terminated, but the xattr name is not, so we need to use strncmp, but that means adjusting for the case where name is a prefix of xattr->name. The corresponding case in __set_xattr() already handles this properly (although in that case *name is also not null terminated). Reported-by: Sergiy Kibrik <sakib@meta.ua> Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph/xattr.c')
-rw-r--r--fs/ceph/xattr.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 6e12a6ba5f79..8c9eba6ef9df 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -219,6 +219,7 @@ static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
struct rb_node **p;
struct rb_node *parent = NULL;
struct ceph_inode_xattr *xattr = NULL;
+ int name_len = strlen(name);
int c;
p = &ci->i_xattrs.index.rb_node;
@@ -226,6 +227,8 @@ static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
parent = *p;
xattr = rb_entry(parent, struct ceph_inode_xattr, node);
c = strncmp(name, xattr->name, xattr->name_len);
+ if (c == 0 && name_len > xattr->name_len)
+ c = 1;
if (c < 0)
p = &(*p)->rb_left;
else if (c > 0)