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| author | Dmitriy Monakhov <dmonakhov@sw.ru> | 2007-05-08 00:24:37 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-08 11:14:59 -0700 |
| commit | 2d3466a348a61c4d7f958ce80020eba17c09d7f7 (patch) | |
| tree | eda69787ec28632b162638055b60dc8371f6432b /fs/reiserfs | |
| parent | 82f703bb8cb2732b4437a9f555a1be564e9e71c2 (diff) | |
| download | linux-2d3466a348a61c4d7f958ce80020eba17c09d7f7.tar.gz | |
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>
Diffstat (limited to 'fs/reiserfs')
| -rw-r--r-- | fs/reiserfs/resize.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/reiserfs/resize.c b/fs/reiserfs/resize.c index 315684793d1d..976cc7887a0d 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); |