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erofs: relax sanity check for tail pclusters due to ztailpacking

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If the tail data can be inlined into the inode meta block, it should
be converted into a regular tail pcluster.

In principle, it should be converted into an uncompressed pcluster if
there is not enough gain to use compression (map->m_llen < map->m_plen);
but since there are various shipped images, relax the condition for
ztailpacking tail pcluster fallback instead of reporting corruption
incorrectly.

Reported-and-tested-by: Yifan Zhao <zhaoyifan28@huawei.com>
Reported-by: Alberto Salvia Novella <es20490446e@gmail.com>
Closes: https://github.com/erofs/erofs-utils/issues/51
Fixes: a5242d37c8 ("erofs: error out obviously illegal extents in advance")
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Gao Xiang
2026-07-08 11:18:45 +08:00
parent 1006b2f57f
commit d3386e1739
1 changed files with 2 additions and 1 deletions
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3
fs/erofs/zmap.c
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@@ -732,7 +732,8 @@ static int z_erofs_map_sanity_check(struct inode *inode,
map->m_algorithmformat, EROFS_I(inode)->nid);
return -EFSCORRUPTED;
}
if (EROFS_MAP_FULL(map->m_flags) && map->m_llen < map->m_plen) {
if (EROFS_MAP_FULL(map->m_flags) && map->m_llen < map->m_plen &&
map->m_la + map->m_llen < inode->i_size) {
erofs_err(inode->i_sb, "too much compressed data @ la %llu of nid %llu",
map->m_la, EROFS_I(inode)->nid);
return -EFSCORRUPTED;