pespin has uploaded this change for review.

View Change

gsmtap_util: Avoid sink_fd leak gsmtap_source_add_sinki() called multiple times

gti->sink_fd could leak if  gsmtap_source_add_sink() was called multiple
times.

Also if gsmtap_source_add_sink_fd() failed, rc != -1 was returned and
hence a close() on a wrong fd would be attempted.

This commit fixes both issues, making the whole sink_fd field much more
robust.

Change-Id: I7af5a6c7d64954ee2cc013711702b846dfaa02b1
---
M src/core/gsmtap_util.c
1 file changed, 10 insertions(+), 2 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/06/41706/1

diff --git a/src/core/gsmtap_util.c b/src/core/gsmtap_util.c
index f1a2abf..065dc51 100644
--- a/src/core/gsmtap_util.c
+++ b/src/core/gsmtap_util.c
@@ -436,7 +436,15 @@
  */
 int gsmtap_source_add_sink(struct gsmtap_inst *gti)
 {
-	return gti->sink_fd = gsmtap_source_add_sink_fd(gsmtap_inst_fd2(gti));
+	int rc;
+
+	if (gti->sink_fd >= 0)
+		return -EALREADY;
+
+	rc = gsmtap_source_add_sink_fd(gsmtap_inst_fd2(gti));
+	if (rc >= 0)
+		gti->sink_fd = rc;
+	return rc;
 }
 
 /* Registered in Osmo IO as a no-op to set the write callback. */
@@ -520,7 +528,7 @@
 		close(gti->source_fd);
 
 
-	if (gti->sink_fd != -1) {
+	if (gti->sink_fd >= 0) {
 		close(gti->sink_fd);
 		gti->sink_fd = -1;
 	}

To view, visit change 41706. To unsubscribe, or for help writing mail filters, visit settings.