1 ext4: fix oops when loading block bitmap failed
3 From: Jan Kara <jack@suse.cz>
5 When we fail to load block bitmap in __ext4_new_inode() we will
6 dereference NULL pointer in ext4_journal_get_write_access(). So check
7 for error from ext4_read_block_bitmap().
10 Cc: stable@vger.kernel.org
11 Signed-off-by: Jan Kara <jack@suse.cz>
12 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
14 fs/ext4/ialloc.c | 4 ++++
15 1 file changed, 4 insertions(+)
17 diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
18 index 8012a5daf401..ac644c31ca67 100644
19 --- a/fs/ext4/ialloc.c
20 +++ b/fs/ext4/ialloc.c
21 @@ -887,6 +887,10 @@ got:
22 struct buffer_head *block_bitmap_bh;
24 block_bitmap_bh = ext4_read_block_bitmap(sb, group);
25 + if (!block_bitmap_bh) {
29 BUFFER_TRACE(block_bitmap_bh, "get block bitmap access");
30 err = ext4_journal_get_write_access(handle, block_bitmap_bh);
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