From: David Zafman <david.zafman@inktank.com>
Date: Thu, 25 Oct 2012 17:23:46 +0000 (-0700)
Subject: ceph: Fix NULL ptr crash in strlen()
X-Git-Tag: firefly_0821_release~3680^2~1324^2~63
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b000056a5a8d3f5a4a9fb80184a7ec14f86a43d4;p=firefly-linux-kernel-4.4.55.git

ceph: Fix NULL ptr crash in strlen()

set_request_path_attr() checks for NULL ptr before calling strlen()

This fixes http://tracker.newdream.net/issues/3404

Signed-off-by: David Zafman <david.zafman@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
---

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 1bcf712655d9..62d2342eb267 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1590,7 +1590,7 @@ static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
 	} else if (rpath || rino) {
 		*ino = rino;
 		*ppath = rpath;
-		*pathlen = strlen(rpath);
+		*pathlen = rpath ? strlen(rpath) : 0;
 		dout(" path %.*s\n", *pathlen, rpath);
 	}