ext4: check iomap type only if ext4_iomap_begin() does not fail

commit fa83c34e3e56b3c672af38059e066242655271b1 upstream.

When ext4_iomap_overwrite_begin() calls ext4_iomap_begin() map blocks may
fail for some reason (e.g. memory allocation failure, bare disk write), and
later because "iomap->type ! = IOMAP_MAPPED" triggers WARN_ON(). When ext4
iomap_begin() returns an error, it is normal that the type of iomap->type
may not match the expectation. Therefore, we only determine if iomap->type
is as expected when ext4_iomap_begin() is executed successfully.

Cc: stable@kernel.org
Reported-by: syzbot+08106c4b7d60702dbc14@syzkaller.appspotmail.com
Link: https://lore.kernel.org/all/00000000000015760b05f9b4eee9@google.com
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230505132429.714648-1-libaokun1@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 42003b5c4cadc73568a41fa0564f97e3d841b087..ffc810436ef213f53ce750cb3e628993799198ac 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3503,7 +3503,7 @@ static int ext4_iomap_overwrite_begin(struct inode *inode, loff_t offset,
         */
        flags &= ~IOMAP_WRITE;
        ret = ext4_iomap_begin(inode, offset, length, flags, iomap, srcmap);
-       WARN_ON_ONCE(iomap->type != IOMAP_MAPPED);
+       WARN_ON_ONCE(!ret && iomap->type != IOMAP_MAPPED);
        return ret;
 }