Re: [syzbot] general protection fault in __pm_runtime_resume (2)

[Pavel Skripkin <paskripkin@gmail.com>]

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On 3/13/22 08:35, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    92f90cc9fe0e Merge tag 'fuse-fixes-5.17-rc8' of git://git...
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=118cd3be700000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=442f8ac61e60a75e
> dashboard link: https://syzkaller.appspot.com/bug?extid=b9bd12fbed3485a3e51f
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15b64e79700000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1652811a700000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+b9bd12fbed3485a3e51f@syzkaller.appspotmail.com
> 

hu->serdev should be checked before passing to pm functions

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





With regards,
Pavel Skripkin

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diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index 34286ffe0568..7ac6908a4dfb 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -629,9 +629,11 @@ static int h5_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 		break;
 	}
 
-	pm_runtime_get_sync(&hu->serdev->dev);
-	pm_runtime_mark_last_busy(&hu->serdev->dev);
-	pm_runtime_put_autosuspend(&hu->serdev->dev);
+	if (hu->serdev) {
+		pm_runtime_get_sync(&hu->serdev->dev);
+		pm_runtime_mark_last_busy(&hu->serdev->dev);
+		pm_runtime_put_autosuspend(&hu->serdev->dev);
+	}
 
 	return 0;
 }