[PATCH] file: Added pointer check

[Denis Arefev]

Return value of a function 'affs_bread' is dereferenced at file.c:970
without checking for null, but it is usually checked for this function.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Denis Arefev <arefev@xxxxxxxxx>
---
 fs/affs/file.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/affs/file.c b/fs/affs/file.c
index d91b0133d95d..4566fa767f65 100644
--- a/fs/affs/file.c
+++ b/fs/affs/file.c
@@ -963,6 +963,8 @@ affs_truncate(struct inode *inode)
 
 	while (ext_key) {
 		ext_bh = affs_bread(sb, ext_key);
+		if (!ext_bh)
+			break;
 		size = AFFS_SB(sb)->s_hashsize;
 		if (size > blkcnt - blk)
 			size = blkcnt - blk;
-- 
2.25.1