[PATCH] fwts_acpica: fix potential null ptr dereference (LP: #1298419)

[Colin King]

From: Colin Ian King <colin.king at canonical.com>

smatch detected a potential null ptr dereference issue, we should
ensure that buffer is allocated before scan it with index().

Signed-off-by: Colin Ian King <colin.king at canonical.com>
---
 src/acpica/fwts_acpica.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/acpica/fwts_acpica.c b/src/acpica/fwts_acpica.c
index 9d92470..cc691c3 100644
--- a/src/acpica/fwts_acpica.c
+++ b/src/acpica/fwts_acpica.c
@@ -440,7 +440,7 @@ void fwts_acpica_vprintf(const char *fmt, va_list args)
 		}
 	}
 
-	if (index(buffer, '\n') != NULL) {
+	if (buffer_len && index(buffer, '\n') != NULL) {
 		fwts_log_info(fwts_acpica_fw, "%s", buffer);
 		free(buffer);
 		buffer_len = 0;
-- 
1.9.1