[PATCH] erofs: avoid reading more for fragment maps

[Gao Xiang]

Since all real encoded extents (directly handled by the decompression
subsystem) have a sane, limited maximum decoded length
(Z_EROFS_PCLUSTER_MAX_DSIZE), and the read‑more policy is only applied
if needed.

However, it makes no sense to read more for non‑encoded maps, such as
fragment extents, since such extents can be huge (up to i_size) and
there is no benefit to reading more at this layer.

For normal images, it does not really matter, but for crafted images
generated by syzbot, excessively large fragment extents can cause
read‑more to run for an overly long time.

Reported-by: syzbot+1a9af3ef3c84c5e14dcc at syzkaller.appspotmail.com
Closes: https://lore.kernel.org/r/68c8583d.050a0220.2ff435.03a3.GAE@google.com
Fixes: b44686c8391b ("erofs: fix large fragment handling")
Fixes: b15b2e307c3a ("erofs: support on-disk compressed fragments data")
Signed-off-by: Gao Xiang <hsiangkao at linux.alibaba.com>
---
 fs/erofs/zdata.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index 2d73297003d2..625b8ae8f67f 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -1835,7 +1835,7 @@ static void z_erofs_pcluster_readmore(struct z_erofs_frontend *f,
 		map->m_la = end;
 		err = z_erofs_map_blocks_iter(inode, map,
 					      EROFS_GET_BLOCKS_READMORE);
-		if (err)
+		if (err || !(map->m_flags & EROFS_MAP_ENCODED))
 			return;
 
 		/* expand ra for the trailing edge if readahead */
@@ -1847,7 +1847,7 @@ static void z_erofs_pcluster_readmore(struct z_erofs_frontend *f,
 		end = round_up(end, PAGE_SIZE);
 	} else {
 		end = round_up(map->m_la, PAGE_SIZE);
-		if (!map->m_llen)
+		if (!(map->m_flags & EROFS_MAP_ENCODED) || !map->m_llen)
 			return;
 	}
 
-- 
2.43.5