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reiserfs: possible null pointer dereference during resize

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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>
This commit is contained in:
Dmitriy Monakhov 2007-05-08 00:24:37 -07:00 committed by Linus Torvalds
parent 82f703bb8c
commit 2d3466a348
1 changed files with 4 additions and 0 deletions
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4
fs/reiserfs/resize.c
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@ -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 /* don't use read_bitmap_block since it will cache
* the uninitialized bitmap */ * the uninitialized bitmap */
bh = sb_bread(s, i * s->s_blocksize * 8); bh = sb_bread(s, i * s->s_blocksize * 8);
if (!bh) {
vfree(bitmap);
return -EIO;
}
memset(bh->b_data, 0, sb_blocksize(sb)); memset(bh->b_data, 0, sb_blocksize(sb));
reiserfs_test_and_set_le_bit(0, bh->b_data); reiserfs_test_and_set_le_bit(0, bh->b_data);
reiserfs_cache_bitmap_metadata(s, bh, bitmap + i); reiserfs_cache_bitmap_metadata(s, bh, bitmap + i);