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| author | Lizhi Xu <lizhi.xu@windriver.com> | 2023-10-09 12:45:57 +0300 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2023-10-28 14:29:22 +0300 |
| commit | 6306ff39a7fcb7e9c59a00e6860b933b71a2ed3e (patch) | |
| tree | f3fb80d090096bbe608a458e38f582c5c279bd02 /fs/jfs | |
| parent | b3856da7906257a80a764d3dfc6b25e876a4403c (diff) | |
| download | linux-6306ff39a7fcb7e9c59a00e6860b933b71a2ed3e.tar.xz | |
jfs: fix log->bdev_handle null ptr deref in lbmStartIO
When sbi->flag is JFS_NOINTEGRITY in lmLogOpen(), log->bdev_handle can't
be inited, so it value will be NULL.
Therefore, add the "log ->no_integrity=1" judgment in lbmStartIO() to avoid such
problems.
Reported-and-tested-by: syzbot+23bc20037854bb335d59@syzkaller.appspotmail.com
Signed-off-by: Lizhi Xu <lizhi.xu@windriver.com>
Link: https://lore.kernel.org/r/20231009094557.1398920-1-lizhi.xu@windriver.com
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/jfs')
| -rw-r--r-- | fs/jfs/jfs_logmgr.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/jfs/jfs_logmgr.c b/fs/jfs/jfs_logmgr.c index c911d838b8ec..cb6d1fda66a7 100644 --- a/fs/jfs/jfs_logmgr.c +++ b/fs/jfs/jfs_logmgr.c @@ -2110,10 +2110,14 @@ static void lbmStartIO(struct lbuf * bp) { struct bio *bio; struct jfs_log *log = bp->l_log; + struct block_device *bdev = NULL; jfs_info("lbmStartIO"); - bio = bio_alloc(log->bdev_handle->bdev, 1, REQ_OP_WRITE | REQ_SYNC, + if (!log->no_integrity) + bdev = log->bdev_handle->bdev; + + bio = bio_alloc(bdev, 1, REQ_OP_WRITE | REQ_SYNC, GFP_NOFS); bio->bi_iter.bi_sector = bp->l_blkno << (log->l2bsize - 9); __bio_add_page(bio, bp->l_page, LOGPSIZE, bp->l_offset); |