From 2d3466a348a61c4d7f958ce80020eba17c09d7f7 Mon Sep 17 00:00:00 2001 From: Dmitriy Monakhov Date: Tue, 8 May 2007 00:24:37 -0700 Subject: [PATCH] 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/reiserfs/resize.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/reiserfs/resize.c b/fs/reiserfs/resize.c index 315684793d..976cc7887a 100644 --- a/fs/reiserfs/resize.c +++ b/fs/reiserfs/resize.c @@ -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); -- 2.39.5