linux-kernel - Re: [syzbot] [PATCH] Test oob in squashfs readahead

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Message-ID: <000000000000308657060a11c90b@google.com>
Date:   Mon, 13 Nov 2023 16:22:46 -0800
From:   syzbot <syzbot+604424eb051c2f696163@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [PATCH] Test oob in squashfs readahead

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Subject: [PATCH] Test oob in squashfs readahead
Author: eadavis@...com

please test squashfs readahead oob

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 13d88ac54ddd

diff --git a/fs/squashfs/file.c b/fs/squashfs/file.c
index 8ba8c4c50770..cb3753782d85 100644
--- a/fs/squashfs/file.c
+++ b/fs/squashfs/file.c
@@ -566,6 +566,8 @@ static void squashfs_readahead(struct readahead_control *ractl)
 
 		max_pages = (expected + PAGE_SIZE - 1) >> PAGE_SHIFT;
 
+		if (!max_pages)
+			break;
 		nr_pages = __readahead_batch(ractl, pages, max_pages);
 		if (!nr_pages)
 			break;