From: Jeff Layton <jlayton@kernel.org>
Date: Tue, 23 Apr 2019 18:18:45 +0000 (-0400)
Subject: ceph: fix NULL pointer deref when debugging is enabled
X-Git-Tag: v5.2-rc1~29^2~19
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=40e7e2c0e86464bca839cdf891bd58a6d41b60b4;p=users%2Fjedix%2Flinux-maple.git

ceph: fix NULL pointer deref when debugging is enabled

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
---

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 9f53c3d99304..7ae0f49349e3 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -928,7 +928,7 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
 
 	dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
 	     (write ? "write" : "read"), file, pos, (unsigned)count,
-	     snapc, snapc->seq);
+	     snapc, snapc ? snapc->seq : 0);
 
 	ret = filemap_write_and_wait_range(inode->i_mapping,
 					   pos, pos + count - 1);