diff mbox

[v2,1/2] opal: Fix the overflow of message notifiers head array

Message ID 20150211062616.3279.71632.stgit@localhost.localdomain (mailing list archive)
State Accepted
Headers show

Commit Message

Neelesh Gupta Feb. 11, 2015, 6:27 a.m. UTC 
Fixes the condition check of incoming message type which can
otherwise shoot beyond the message notifiers head array.

Signed-off-by: Neelesh Gupta <neelegup@linux.vnet.ibm.com>
Reviewed-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/opal.c |   12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

Comments

Anshuman Khandual Feb. 11, 2015, 10:53 a.m. UTC | #1 
On 02/11/2015 11:57 AM, Neelesh Gupta wrote:
> Fixes the condition check of incoming message type which can
> otherwise shoot beyond the message notifiers head array.
> 
> Signed-off-by: Neelesh Gupta <neelegup@linux.vnet.ibm.com>
> Reviewed-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Reviewed-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
diff mbox

Patch

diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index f10b9ec..2651e22 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -305,16 +305,12 @@  void opal_notifier_disable(void)
 int opal_message_notifier_register(enum OpalMessageType msg_type,
 					struct notifier_block *nb)
 {
-	if (!nb) {
-		pr_warning("%s: Invalid argument (%p)\n",
-			   __func__, nb);
-		return -EINVAL;
-	}
-	if (msg_type > OPAL_MSG_TYPE_MAX) {
-		pr_warning("%s: Invalid message type argument (%d)\n",
+	if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) {
+		pr_warning("%s: Invalid arguments, msg_type:%d\n",
 			   __func__, msg_type);
 		return -EINVAL;
 	}
+
 	return atomic_notifier_chain_register(
 				&opal_msg_notifier_head[msg_type], nb);
 }
@@ -351,7 +347,7 @@  static void opal_handle_message(void)
 	type = be32_to_cpu(msg.msg_type);
 
 	/* Sanity check */
-	if (type > OPAL_MSG_TYPE_MAX) {
+	if (type >= OPAL_MSG_TYPE_MAX) {
 		pr_warning("%s: Unknown message type: %u\n", __func__, type);
 		return;
 	}