From: Gerhard Sittig <redacted>
Date: Fri, 9 Feb 2018 18:26:42 +0000 (+0100)
Subject: rigol-ds: silence potential NULL dereference compiler warning
X-Git-Url: https://sigrok.org/gitweb/?a=commitdiff_plain;h=0306ae30b692413b79c69df34a8916727c0282b6;p=libsigrok.git

rigol-ds: silence potential NULL dereference compiler warning

Check pointers' validity before dereferencing them.

This was reported by clang's scan-build.
---

diff --git a/src/hardware/rigol-ds/api.c b/src/hardware/rigol-ds/api.c
index 443d89dd..bcea8999 100644
--- a/src/hardware/rigol-ds/api.c
+++ b/src/hardware/rigol-ds/api.c
@@ -752,6 +752,8 @@ static int config_list(uint32_t key, GVariant **data,
 	case SR_CONF_DEVICE_OPTIONS:
 		if (!cg)
 			return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
+		if (!devc)
+			return SR_ERR_ARG;
 		if (cg == devc->digital_group) {
 			*data = std_gvar_array_u32(NULL, 0);
 			return SR_OK;