KDrive: Fix error handlig in tslib driver

If ts_open() fails and return NULL, then next call to ts_fd()
segfaults because of NULL dereference. There is no need to
check output of ts_fd() as ts_open() did this internally.

Signed-off-by: Paulius Zaleckas <paulius.zaleckas@gmail.com>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
(cherry picked from commit 8990b31214bcbc08090604147287455bfde91c11)

1 files changed, 11 insertions, 4 deletions

diff --git a/hw/kdrive/linux/tslib.c b/hw/kdrive/linux/tslib.c
index 48a084220..570cbf99a 100644
--- a/hw/kdrive/linux/tslib.c
+++ b/hw/kdrive/linux/tslib.c
@@ -117,15 +117,22 @@ TslibEnable (KdPointerInfo *pi)
         pi->path = strdup("/dev/input/touchscreen0");
         ErrorF("[tslib/TslibEnable] no device path given, trying %s\n", pi->path);
     }
+
     private->tsDev = ts_open(pi->path, 0);
-    private->fd = ts_fd(private->tsDev);
-    if (!private->tsDev || ts_config(private->tsDev) || private->fd < 0) {
+    if (!private->tsDev) {
         ErrorF("[tslib/TslibEnable] failed to open %s\n", pi->path);
-        if (private->fd >= 0)
-            close(private->fd);
         return BadAlloc;
     }
 
+    if (ts_config(private->tsDev)) {
+        ErrorF("[tslib/TslibEnable] failed to load configuration\n");
+        ts_close(private->tsDev);
+        private->tsDev = NULL;
+        return BadValue;
+    }
+
+    private->fd = ts_fd(private->tsDev);
+
     KdRegisterFd(private->fd, TsRead, pi);
 
     return Success;