erofs: fix interlaced plain identification for encoded extents

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[ Upstream commit 4a2d046e4b ]

Only plain data whose start position and on-disk physical length are
both aligned to the block size should be classified as interlaced
plain extents. Otherwise, it must be treated as shifted plain extents.

This issue was found by syzbot using a crafted compressed image
containing plain extents with unaligned physical lengths, which can
cause OOB read in z_erofs_transform_plain().

Reported-and-tested-by: syzbot+d988dc155e740d76a331@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/r/699d5714.050a0220.cdd3c.03e7.GAE@google.com
Fixes: 1d191b4ca5 ("erofs: implement encoded extent metadata")
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Gao Xiang 2026-02-24 18:31:25 +08:00 • committed by Sasha Levin

parent d2e7c898cc

commit 9d5a97bc71

1 changed files with 5 additions and 4 deletions

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fs/erofs/zmap.c

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