linux-kernel - [GIT PULL 01/15] stm: Potential read overflow in stm_char_policy_set

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Date:   Fri, 25 Aug 2017 19:15:52 +0300
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Greg KH <greg@...ah.com>
Cc:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Chunyan Zhang <zhang.chunyan@...aro.org>,
        linux-kernel@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [GIT PULL 01/15] stm: Potential read overflow in stm_char_policy_set_ioctl()

From: Dan Carpenter <dan.carpenter@...cle.com>

The "size" variable comes from the user so we need to verify that it's
large enough to hold an stp_policy_id struct.

Fixes: 7bd1d4093c2f ("stm class: Introduce an abstraction for System Trace Module devices")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
---
 drivers/hwtracing/stm/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
index 0e731143f6..9414900575 100644
--- a/drivers/hwtracing/stm/core.c
+++ b/drivers/hwtracing/stm/core.c
@@ -566,7 +566,7 @@ static int stm_char_policy_set_ioctl(struct stm_file *stmf, void __user *arg)
 	if (copy_from_user(&size, arg, sizeof(size)))
 		return -EFAULT;
 
-	if (size >= PATH_MAX + sizeof(*id))
+	if (size < sizeof(*id) || size >= PATH_MAX + sizeof(*id))
 		return -EINVAL;
 
 	/*
-- 
2.14.1