linux-kernel - [patch] gru: fix a sanity test in gru_set_context

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Message-ID: <20130519125950.GA17651@elgon.mountain>
Date:	Sun, 19 May 2013 15:59:50 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Dimitri Sivanich <sivanich@....com>
Cc:	Robin Holt <holt@....com>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] gru: fix a sanity test in gru_set_context_option()

"req.val1 == -1" is valid but it doesn't make sense to check
gru_base[-1].  gru_base[] is a global array.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
index c4acac7..e7c37b2 100644
--- a/drivers/misc/sgi-gru/grufault.c
+++ b/drivers/misc/sgi-gru/grufault.c
@@ -876,7 +876,8 @@ int gru_set_context_option(unsigned long arg)
 	switch (req.op) {
 	case sco_blade_chiplet:
 		/* Select blade/chiplet for GRU context */
-		if (req.val1 < -1 || req.val1 >= GRU_MAX_BLADES || !gru_base[req.val1] ||
+		if (req.val1 < -1 || req.val1 >= GRU_MAX_BLADES ||
+		    (req.val1 != -1 && !gru_base[req.val1]) ||
 		    req.val0 < -1 || req.val0 >= GRU_CHIPLETS_PER_HUB) {
 			ret = -EINVAL;
 		} else {
--
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