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erofs/zmap.c: Fix incorrect offset calculation

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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
Dashboard 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>
This commit is contained in:
Siddh Raman Pant 2022-12-09 15:51:51 +05:30 committed by Gao Xiang
parent 88603b6dc4
commit 6acd87d509
1 changed files with 7 additions and 3 deletions
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10
fs/erofs/zmap.c
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@ -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;