Commit 2d3466a3 authored May 08, 2007 by Dmitriy Monakhov Committed by Linus Torvalds May 08, 2007

reiserfs: possible null pointer dereference during resize



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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 82f703bb

fs/reiserfs/resize.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -131,6 +131,10 @@ int reiserfs_resize(struct super_block *s, unsigned long block_count_new)
		/* 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);