From: Jeff Mahoney <jeffm@suse.com>
Date: Thu, 1 Mar 2012 13:56:28 +0000 (+0100)
Subject: btrfs: avoid NULL deref in btrfs_reserve_extent with DEBUG_ENOSPC
X-Git-Tag: v3.4-rc3~11^2~20^2~27
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=538042801a479ebd316582ad10a9c3156b5b7548;p=profile%2Fcommon%2Fkernel-common.git

btrfs: avoid NULL deref in btrfs_reserve_extent with DEBUG_ENOSPC

 __find_space_info can return NULL but we don't check it before calling
 dump_space_info().

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
---

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 37e0a80..c32a9bf 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5838,7 +5838,8 @@ again:
 			printk(KERN_ERR "btrfs allocation failed flags %llu, "
 			       "wanted %llu\n", (unsigned long long)data,
 			       (unsigned long long)num_bytes);
-			dump_space_info(sinfo, num_bytes, 1);
+			if (sinfo)
+				dump_space_info(sinfo, num_bytes, 1);
 		}
 	}