[PATCH 6.1 054/321] squashfs: squashfs_read_data need to check if the length is 0

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6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lizhi Xu <lizhi.xu@xxxxxxxxxxxxx>

[ Upstream commit eb66b8abae98f869c224f7c852b685ae02144564 ]

When the length passed in is 0, the pagemap_scan_test_walk() caller should
bail.  This error causes at least a WARN_ON().

Link: https://lkml.kernel.org/r/20231116031352.40853-1-lizhi.xu@xxxxxxxxxxxxx
Reported-by: syzbot+32d3767580a1ea339a81@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://lkml.kernel.org/r/0000000000000526f2060a30a085@xxxxxxxxxx
Signed-off-by: Lizhi Xu <lizhi.xu@xxxxxxxxxxxxx>
Reviewed-by: Phillip Lougher <phillip@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/squashfs/block.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/squashfs/block.c b/fs/squashfs/block.c
index 833aca92301f0..45ea5d62cef42 100644
--- a/fs/squashfs/block.c
+++ b/fs/squashfs/block.c
@@ -198,7 +198,7 @@ int squashfs_read_data(struct super_block *sb, u64 index, int length,
 		TRACE("Block @ 0x%llx, %scompressed size %d\n", index - 2,
 		      compressed ? "" : "un", length);
 	}
-	if (length < 0 || length > output->length ||
+	if (length <= 0 || length > output->length ||
 			(index + length) > msblk->bytes_used) {
 		res = -EIO;
 		goto out;
-- 
2.43.0







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