[dpdk-dev] [PATCH] eal: fix build with gcc 4.7

[Pablo de Lara <pablo.de.lara.guarch@intel.com>]

Fixed possible out-of-bounds issue:

lib/librte_eal/common/eal_common_devargs.c:
	In function ‘rte_devargs_layers_parse’:
lib/librte_eal/common/eal_common_devargs.c:121:7:
	error: array subscript is above array bounds

Bugzilla ID: 71
Fixes: 338327d731e6 ("devargs: add function to parse device layers")

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
---
 lib/librte_eal/common/eal_common_devargs.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/lib/librte_eal/common/eal_common_devargs.c b/lib/librte_eal/common/eal_common_devargs.c
index a22a2002e..1a7b00ece 100644
--- a/lib/librte_eal/common/eal_common_devargs.c
+++ b/lib/librte_eal/common/eal_common_devargs.c
@@ -118,12 +118,17 @@ rte_devargs_layers_parse(struct rte_devargs *devargs,
 	}
 
 	while (s != NULL) {
-		if (strncmp(layers[i].key, s,
-			    strlen(layers[i].key)) &&
-		    /* The last layer is free-form.
-		     * The "driver" key is not required (but accepted).
-		     */
-		    i != RTE_DIM(layers) - 1)
+		if (i >= RTE_DIM(layers)) {
+			RTE_LOG(ERR, EAL, "Unrecognized layer %s\n", s);
+			ret = -EINVAL;
+			goto get_out;
+		}
+		/*
+		 * The last layer is free-form.
+		 * The "driver" key is not required (but accepted).
+		 */
+		if (strncmp(layers[i].key, s, strlen(layers[i].key)) &&
+				i != RTE_DIM(layers) - 1)
 			goto next_layer;
 		layers[i].str = s;
 		layers[i].kvlist = rte_kvargs_parse_delim(s, NULL, "/");
@@ -136,11 +141,6 @@ rte_devargs_layers_parse(struct rte_devargs *devargs,
 		if (s != NULL)
 			s++;
 next_layer:
-		if (i >= RTE_DIM(layers)) {
-			RTE_LOG(ERR, EAL, "Unrecognized layer %s\n", s);
-			ret = -EINVAL;
-			goto get_out;
-		}
 		i++;
 	}
 
-- 
2.14.4