From: Dmitriy Monakhov <dmonakhov@sw.ru>

sb_read may return NULL, let's explicitly check it.
If so free new bitmap blocks array, after this we may 		safely exit as it done
above during bitmap allocation.

Signed-off-by: Dmitriy Monakhov <dmonakhov@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/reiserfs/resize.c |    4 ++++
 1 file changed, 4 insertions(+)

diff -puN fs/reiserfs/resize.c~reiserfs-possible-null-pointer-dereference-during-resize fs/reiserfs/resize.c
--- a/fs/reiserfs/resize.c~reiserfs-possible-null-pointer-dereference-during-resize
+++ a/fs/reiserfs/resize.c
@@ -131,6 +131,10 @@ int reiserfs_resize(struct super_block *
 			/* don't use read_bitmap_block since it will cache
 			 * the uninitialized bitmap */
 			bh = sb_bread(s, i * s->s_blocksize * 8);
+			if (!bh) {
+				vfree(bitmap);
+				return -EIO;
+			}
 			memset(bh->b_data, 0, sb_blocksize(sb));
 			reiserfs_test_and_set_le_bit(0, bh->b_data);
 			reiserfs_cache_bitmap_metadata(s, bh, bitmap + i);
_