r300g: Check return value of snprintf().

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

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

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 (file)
--- 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;