erofs: validate the extent length for uncompressed pclusters
[ Upstream commitc505feba4c
] syzkaller reported a KASAN use-after-free: https://syzkaller.appspot.com/bug?extid=2ae90e873e97f1faf6f2 The referenced fuzzed image actually has two issues: - m_pa == 0 as a non-inlined pcluster; - The logical length is longer than its physical length. The first issue has already been addressed. This patch addresses the second issue by checking the extent length validity. Reported-by: syzbot+2ae90e873e97f1faf6f2@syzkaller.appspotmail.com Fixes:02827e1796
("staging: erofs: add erofs_map_blocks_iter") Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com> Link: https://lore.kernel.org/r/20221205150050.47784-2-hsiangkao@linux.alibaba.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -677,6 +677,11 @@ static int z_erofs_do_map_blocks(struct inode *inode,
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}
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if (m.headtype == Z_EROFS_VLE_CLUSTER_TYPE_PLAIN) {
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if (map->m_llen > map->m_plen) {
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DBG_BUGON(1);
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err = -EFSCORRUPTED;
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goto unmap_out;
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}
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if (vi->z_advise & Z_EROFS_ADVISE_INTERLACED_PCLUSTER)
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map->m_algorithmformat =
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Z_EROFS_COMPRESSION_INTERLACED;
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