Mesa (10.4): r300g: Check return value of snprintf().

[Emil Velikov]

Module: Mesa
Branch: 10.4
Commit: 93273f16afd4be9bf4ff364a21217994837b28bb
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=93273f16afd4be9bf4ff364a21217994837b28bb

Author: Matt Turner <mattst88 at gmail.com>
Date:   Tue Mar  3 16:09:58 2015 -0800

r300g: Check return value of snprintf().

Would have at least prevented the crash the previous patch fixed.

Cc: 10.4, 10.5 <mesa-stable at lists.freedesktop.org>
Bugzilla: https://bugs.gentoo.org/show_bug.cgi?id=540970
Reviewed-by: Tom Stellard <thomas.stellard at amd.com>
(cherry picked from commit ade0b580e75bdea227eec5345f6681b678d0811b)

---

 src/gallium/drivers/r300/compiler/tests/rc_test_helpers.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/r300/compiler/tests/rc_test_helpers.c b/src/gallium/drivers/r300/compiler/tests/rc_test_helpers.c
index 422bdb0..04c01f1 100644
--- a/src/gallium/drivers/r300/compiler/tests/rc_test_helpers.c
+++ b/src/gallium/drivers/r300/compiler/tests/rc_test_helpers.c
@@ -541,9 +541,14 @@ unsigned load_program(
 	unsigned *count;
 	char **string_store;
 	unsigned i = 0;
+	int n;
 
 	memset(line, 0, sizeof(line));
-	snprintf(path, PATH_MAX, TEST_PATH "/%s", filename);
+	n = snprintf(path, PATH_MAX, TEST_PATH "/%s", filename);
+	if (n < 0 || n >= PATH_MAX) {
+		return 0;
+	}
+
 	file = fopen(path, "r");
 	if (!file) {
 		return 0;