linux-kernel - Re: [syzbot] [PATCH] Fix the null pointer deference in nsim_setup_prog_hw

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Message-ID: <000000000000e8bf930609bcddfa@google.com>
Date:   Thu, 09 Nov 2023 11:04:01 -0800
From:   syzbot <syzbot+bbe84a4010eeea00982d@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [PATCH] Fix the null pointer deference in nsim_setup_prog_hw_checks

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***

Subject: [PATCH] Fix the null pointer deference in nsim_setup_prog_hw_checks
Author: kdipendra88@...il.com

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git 8de1e7afcc1c

Signed-off-by: Dipendra Khadka <kdipendra88@...il.com>
---
 drivers/net/netdevsim/bpf.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/netdevsim/bpf.c b/drivers/net/netdevsim/bpf.c
index f60eb97e3a62..89206278b6cc 100644
--- a/drivers/net/netdevsim/bpf.c
+++ b/drivers/net/netdevsim/bpf.c
@@ -317,9 +317,11 @@ nsim_setup_prog_hw_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
 	}
 
 	state = bpf->prog->aux->offload->dev_priv;
-	if (WARN_ON(strcmp(state->state, "xlated"))) {
-		NSIM_EA(bpf->extack, "offloading program in bad state");
-		return -EINVAL;
+	if(state) {
+		if (WARN_ON(strcmp(state->state, "xlated"))) {
+			NSIM_EA(bpf->extack, "offloading program in bad state");
+			return -EINVAL;
+		}
 	}
 	return 0;
 }
-- 
2.34.1