From: Gerhard Sittig <redacted>
Date: Sun, 16 May 2021 12:45:47 +0000 (+0200)
Subject: rigol-dg: free memory that was allocated by SCPI get routines
X-Git-Url: https://sigrok.org/gitweb/?p=libsigrok.git;a=commitdiff_plain;h=ff85a7f0ab3cedf0b44b48e6f3e59da9c767d53b

rigol-dg: free memory that was allocated by SCPI get routines

The SCPI get routines may allocate memory for response data which
callers have to free after use.

Move an existing release call to an earlier location, to avoid leaking
memory when an error path is taken.

This addresses part of bug #1683.
---

diff --git a/src/hardware/rigol-dg/api.c b/src/hardware/rigol-dg/api.c
index ea8189b9..e8a3aadc 100644
--- a/src/hardware/rigol-dg/api.c
+++ b/src/hardware/rigol-dg/api.c
@@ -780,6 +780,7 @@ static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 			devc->counter_enabled = TRUE;
 		else
 			devc->counter_enabled = FALSE;
+		g_free(response);
 
 		if (!devc->counter_enabled) {
 			/*
@@ -834,8 +835,6 @@ static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 		}
 	}
 
-	g_free(response);
-
 	return ret;
 }