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UPSTREAM: erofs: ensure m_llen is reset to 0 if metadata is invalid

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Sometimes, the on-disk metadata might be invalid due to user
interrupts, storage failures, or other unknown causes.

In that case, z_erofs_map_blocks_iter() may still return a valid
m_llen while other fields remain invalid (e.g., m_plen can be 0).

Due to the return value of z_erofs_scan_folio() in some path will
be ignored on purpose, the following z_erofs_scan_folio() could
then use the invalid value by accident.

Let's reset m_llen to 0 to prevent this.

Link: https://lore.kernel.org/r/20240629185743.2819229-1-hsiangkao@linux.alibaba.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

(cherry picked from commit 9b32b063be
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ master)

Bug: 349541961
Change-Id: Iaa27697bb69cf1262af64c680f625baa72baf821
Signed-off-by: zhoumaowei <zhoumaowei@oppo.com>
This commit is contained in:
zhoumaowei 2024-07-08 17:16:45 +08:00 committed by Sandeep Dhavale
parent 2a09862b0d
commit 2414c5e05b
1 changed files with 2 additions and 0 deletions
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2
fs/erofs/zmap.c
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@ -723,6 +723,8 @@ int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map,
err = z_erofs_do_map_blocks(inode, map, flags);
out:
if (err)
map->m_llen = 0;
trace_z_erofs_map_blocks_iter_exit(inode, map, flags, err);
return err;
}