From: Alexandru Gagniuc <redacted>
Date: Wed, 5 Dec 2012 21:16:52 +0000 (-0600)
Subject: serial-dmm: Fix segfault when no device is used
X-Git-Tag: dsupstream~471
X-Git-Url: https://sigrok.org/gitweb/?p=libsigrok.git;a=commitdiff_plain;h=26be4ebef369e465eb5f13ee7bbab71b62e455f6

serial-dmm: Fix segfault when no device is used

di was initialized as NULL. If no device covered by this driver
is used, di remains NULL. This causes a segmentation fault when
calling clear_instances().

Check for di being NULL.

Signed-off-by: Alexandru Gagniuc <redacted>
---

diff --git a/hardware/serial-dmm/api.c b/hardware/serial-dmm/api.c
index 8a2d7be2..be240e23 100644
--- a/hardware/serial-dmm/api.c
+++ b/hardware/serial-dmm/api.c
@@ -151,6 +151,10 @@ static int clear_instances(void)
 	struct dev_context *devc;
 	GSList *l;
 
+	/* di is not necessarily initialized */
+	if (!di)
+		return SR_OK;
+
 	if (!(drvc = di->priv))
 		return SR_OK;