linux-kernel - [PATCH] ipmi: ssif: potential NULL dereference in msg_done

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Date:   Fri, 1 Apr 2022 11:27:45 +0800
From:   Haowen Bai <baihaowen@...zu.com>
To:     Corey Minyard <minyard@....org>
CC:     Haowen Bai <baihaowen@...zu.com>,
        <openipmi-developer@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] ipmi: ssif: potential NULL dereference in msg_done_handler()

msg could be null without checking null and return, but still dereference
msg->rsp[2] and will lead to a null pointer trigger.

Signed-off-by: Haowen Bai <baihaowen@...zu.com>
---
 drivers/char/ipmi/ipmi_ssif.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/ipmi/ipmi_ssif.c b/drivers/char/ipmi/ipmi_ssif.c
index f199cc1..9383de3 100644
--- a/drivers/char/ipmi/ipmi_ssif.c
+++ b/drivers/char/ipmi/ipmi_ssif.c
@@ -814,7 +814,7 @@ static void msg_done_handler(struct ssif_info *ssif_info, int result,
 		break;
 
 	case SSIF_GETTING_EVENTS:
-		if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
+		if ((result < 0) || (len < 3) || (msg && (msg->rsp[2] != 0))) {
 			/* Error getting event, probably done. */
 			msg->done(msg);
 
-- 
2.7.4