linux-kernel - [PATCH] drivers: misc: ti-st: fix potential race if st_kim

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Message-Id: <1377762948-13545-1-git-send-email-oleksandr.kozaruk@globallogic.com>
Date:	Thu, 29 Aug 2013 10:55:48 +0300
From:	Oleksandr Kozaruk <alkhozar@...il.com>
To:	gregkh@...uxfoundation.org, chao.bi@...el.com,
	yongjun_wei@...ndmicro.com.cn
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] drivers: misc: ti-st: fix potential race if st_kim_start fails

If st_kim_start() fails registered protocols should be removed. This is
done by calling st_reg_complete(), which as comment states is called
with spin lock held. But in st_register() when st_kim_start fails it
is called without holding spin lock, creating possibility of concurrent
access to st_gdata data members.
Hold spin lock while calling st_reg_complete if st_kim_start() fails.

Signed-off-by: Oleksandr Kozaruk <oleksandr.kozaruk@...ballogic.com>
---
 drivers/misc/ti-st/st_core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/misc/ti-st/st_core.c b/drivers/misc/ti-st/st_core.c
index 0a14280..8d64b68 100644
--- a/drivers/misc/ti-st/st_core.c
+++ b/drivers/misc/ti-st/st_core.c
@@ -562,7 +562,9 @@ long st_register(struct st_proto_s *new_proto)
 			if ((st_gdata->protos_registered != ST_EMPTY) &&
 			    (test_bit(ST_REG_PENDING, &st_gdata->st_state))) {
 				pr_err(" KIM failure complete callback ");
+				spin_lock_irqsave(&st_gdata->lock, flags);
 				st_reg_complete(st_gdata, err);
+				spin_unlock_irqrestore(&st_gdata->lock, flags);
 				clear_bit(ST_REG_PENDING, &st_gdata->st_state);
 			}
 			return -EINVAL;
-- 
1.8.1.2

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