linux-kernel - [PATCH] vme: Fix a possible sleep-in-atomic bug in vme

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Date:   Tue, 12 Dec 2017 20:51:53 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     martyn@...chs.me.uk, manohar.vanga@...il.com,
        gregkh@...uxfoundation.org, elfring@...rs.sourceforge.net,
        martyn.welch@...com
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] vme: Fix a possible sleep-in-atomic bug in vme_tsi148

The driver may sleep under a spinlock.
The function call path is:
tsi148_master_write \ tsi148_master_read (acquire the spinlock)
  vme_register_error_handler
    kmalloc(GFP_KERNEL) --> may sleep

To fix it, GFP_KERNEL is replaced with GFP_ATOMIC.

This bug is found by my static analysis tool(DSAC) and checked by my code review.

Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
 drivers/vme/vme.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vme/vme.c b/drivers/vme/vme.c
index 8124622..92500f6 100644
--- a/drivers/vme/vme.c
+++ b/drivers/vme/vme.c
@@ -1290,7 +1290,7 @@ struct vme_error_handler *vme_register_error_handler(
 {
 	struct vme_error_handler *handler;
 
-	handler = kmalloc(sizeof(*handler), GFP_KERNEL);
+	handler = kmalloc(sizeof(*handler), GFP_ATOMIC);
 	if (!handler)
 		return NULL;
 
-- 
1.7.9.5