erofs/zmap.c: Fix incorrect offset calculation

[ Upstream commit 6acd87d50998ef0afafc441613aeaf5a8f5c9eff ]

Effective offset to add to length was being incorrectly calculated,
which resulted in iomap->length being set to 0, triggering a WARN_ON
in iomap_iter_done().

Fix that, and describe it in comments.

This was reported as a crash by syzbot under an issue about a warning
encountered in iomap_iter_done(), but unrelated to erofs.

C reproducer: https://syzkaller.appspot.com/text?tag=ReproC&x=1037a6b2880000
Kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&x=e2021a61197ebe02
link: https://syzkaller.appspot.com/bug?extid=a8e049cd3abd342936b6
Reported-by: syzbot+a8e049cd3abd342936b6@syzkaller.appspotmail.com
Suggested-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Siddh Raman Pant <code@siddh.me>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20221209102151.311049-1-code@siddh.me
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/erofs/zmap.c b/fs/erofs/zmap.c
index e6d5d7a..39cc014 100644 (file)
--- a/fs/erofs/zmap.c
+++ b/fs/erofs/zmap.c
@@ -793,12 +793,16 @@ static int z_erofs_iomap_begin_report(struct inode *inode, loff_t offset,
                iomap->type = IOMAP_HOLE;
                iomap->addr = IOMAP_NULL_ADDR;
                /*
-                * No strict rule how to describe extents for post EOF, yet
-                * we need do like below. Otherwise, iomap itself will get
+                * No strict rule on how to describe extents for post EOF, yet
+                * we need to do like below. Otherwise, iomap itself will get
                 * into an endless loop on post EOF.
+                *
+                * Calculate the effective offset by subtracting extent start
+                * (map.m_la) from the requested offset, and add it to length.
+                * (NB: offset >= map.m_la always)
                 */
                if (iomap->offset >= inode->i_size)
-                       iomap->length = length + map.m_la - offset;
+                       iomap->length = length + offset - map.m_la;
        }
        iomap->flags = 0;
        return 0;