From: Jan Kara <jack@xxxxxxx>
3.4.106-rc1 review patch. If anyone has any objections, please let me know.
------------------
commit 599a9b77ab289d85c2d5c8607624efbe1f552b0f upstream.
When we fail to load block bitmap in __ext4_new_inode() we will
dereference NULL pointer in ext4_journal_get_write_access(). So check
for error from ext4_read_block_bitmap().
Coverity-id: 989065
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Zefan Li <lizefan@xxxxxxxxxx>
---
fs/ext4/ialloc.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 75c4f36..97ca4b6 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -725,6 +725,10 @@ got:
struct buffer_head *block_bitmap_bh;
block_bitmap_bh = ext4_read_block_bitmap(sb, group);
+ if (!block_bitmap_bh) {
+ err = -EIO;
+ goto out;
+ }
BUFFER_TRACE(block_bitmap_bh, "get block bitmap access");
err = ext4_journal_get_write_access(handle, block_bitmap_bh);
if (err) {
--
1.9.1
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