From: Gerhard Sittig <redacted>
Date: Fri, 9 Feb 2018 18:03:06 +0000 (+0100)
Subject: hantek-6xxx: fix potential NULL dereference
X-Git-Url: http://sigrok.org/gitweb/?a=commitdiff_plain;h=e93ca8a4d66a42517a21f6c34bba7cd73dc042d8;p=libsigrok.git

hantek-6xxx: fix potential NULL dereference

Check pointers' validity before dereferencing.

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

diff --git a/src/hardware/hantek-6xxx/api.c b/src/hardware/hantek-6xxx/api.c
index 4e648089..01cba566 100644
--- a/src/hardware/hantek-6xxx/api.c
+++ b/src/hardware/hantek-6xxx/api.c
@@ -460,6 +460,8 @@ static int config_list(uint32_t key, GVariant **data,
 			*data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg));
 			break;
 		case SR_CONF_COUPLING:
+			if (!devc)
+				return SR_ERR_ARG;
 			*data = g_variant_new_strv(devc->coupling_vals, devc->coupling_tab_size);
 			break;
 		case SR_CONF_VDIV: