[gpsd-dev] [PATCH] Improved resilience in gps_shm_close() in case it is called after an unsuccessful gps_shm_open()

[Robert Norris]

Check that the structure exists before trying to use a component of it.
---
 libgps_shm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libgps_shm.c b/libgps_shm.c
index a0dfdde..872a089 100644
--- a/libgps_shm.c
+++ b/libgps_shm.c
@@ -154,6 +154,8 @@ int gps_shm_read(struct gps_data_t *gpsdata)
 
 void gps_shm_close(struct gps_data_t *gpsdata)
 {
+    if (PRIVATE(gpsdata) == NULL)
+       return;
     if (PRIVATE(gpsdata)->shmseg != NULL)
        (void)shmdt((const void *)PRIVATE(gpsdata)->shmseg);
 }
-- 
2.8.1