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From: Edward Adam Davis <eadavis@qq.com>
To: syzbot+27cc650ef45b379dfe5a@syzkaller.appspotmail.com
Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: [syzbot] [erofs?] BUG: using smp_processor_id() in preemptible code in z_erofs_get_gbuf
Date: Tue,  9 Apr 2024 09:16:21 +0800	[thread overview]
Message-ID: <tencent_12296C83BC04535760577A26D4336AA36005@qq.com> (raw)
In-Reply-To: <00000000000084b9dd061599e789@google.com>

please test wrong context using smp_processor_id

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 2b3d5988ae2c

diff --git a/fs/erofs/zutil.c b/fs/erofs/zutil.c
index 9687cad8be96..0a3d9eecbf16 100644
--- a/fs/erofs/zutil.c
+++ b/fs/erofs/zutil.c
@@ -35,8 +35,11 @@ void *z_erofs_get_gbuf(unsigned int requiredpages)
 	__acquires(gbuf->lock)
 {
 	struct z_erofs_gbuf *gbuf;
+	unsigned long flags;
 
+	local_irq_save(flags);
 	gbuf = &z_erofs_gbufpool[z_erofs_gbuf_id()];
+	local_irq_restore(flags);
 	spin_lock(&gbuf->lock);
 	/* check if the buffer is too small */
 	if (requiredpages > gbuf->nrpages) {


  reply	other threads:[~2024-04-09  1:16 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-08 18:23 syzbot
2024-04-09  1:16 ` Edward Adam Davis [this message]
2024-04-10  0:36   ` syzbot
2024-04-09  1:47 ` Gao Xiang
2024-04-10  5:19   ` syzbot
2024-04-23 23:34     ` Gao Xiang

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