linux-kernel - Re: [syzbot] [reiserfs?] general protection fault in __fget

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Date: Fri,  5 Jan 2024 21:14:23 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+63cebbb27f598a7f901b@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [reiserfs?] general protection fault in __fget_files (2)

please test general protection fault in __fget_files

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git f5837722ffec

diff --git a/fs/file.c b/fs/file.c
index 5fb0b146e79e..724f60e6cc4f 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -1134,6 +1134,8 @@ static unsigned long __fget_light(unsigned int fd, fmode_t mask)
 			return 0;
 		return (unsigned long)file;
 	} else {
+		if (!atomic_read_acquire(&files->count))
+			return 0;
 		file = __fget(fd, mask);
 		if (!file)
 			return 0;