linux-kernel - Re: [syzbot] [PATCH wireless] wifi: ath6kl: remove WARN on bad firmware input

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Message-ID: <68513947.a70a0220.395abc.0210.GAE@google.com>
Date: Tue, 17 Jun 2025 02:45:43 -0700
From: syzbot <syzbot+92c6dd14aaa230be6855@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [PATCH wireless] wifi: ath6kl: remove WARN on bad
 firmware input

For archival purposes, forwarding an incoming command email to
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com.

***

Subject: [PATCH wireless] wifi: ath6kl: remove WARN on bad firmware input
Author: johannes@...solutions.net

From: Johannes Berg <johannes.berg@...el.com>

If the firmware gives bad input, that's nothing to do with
the driver's stack at this point etc., so the WARN_ON()
doesn't add any value. Additionally, this is one of the
top syzbot reports now. Just print a message, and as an
added bonus, print the sizes too.

Reported-by: syzbot+92c6dd14aaa230be6855@...kaller.appspotmail.com
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
---
#syz test
---
 drivers/net/wireless/ath/ath6kl/bmi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath6kl/bmi.c b/drivers/net/wireless/ath/ath6kl/bmi.c
index af98e871199d..5a9e93fd1ef4 100644
--- a/drivers/net/wireless/ath/ath6kl/bmi.c
+++ b/drivers/net/wireless/ath/ath6kl/bmi.c
@@ -87,7 +87,9 @@ int ath6kl_bmi_get_target_info(struct ath6kl *ar,
 		 * We need to do some backwards compatibility to make this work.
 		 */
 		if (le32_to_cpu(targ_info->byte_count) != sizeof(*targ_info)) {
-			WARN_ON(1);
+			ath6kl_err("mismatched byte count %d vs. expected %zd\n",
+				   le32_to_cpu(targ_info->byte_count),
+				   sizeof(*targ_info));
 			return -EINVAL;
 		}
 
-- 
2.49.0