Staging: easycap: use after free in easycap_delete()

The JOM() macro dereferences peasycap, so I moved the free down some
lines.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/staging/easycap/easycap_main.c b/drivers/staging/easycap/easycap_main.c
index 62e07f6a026..84d4f77ef46 100644
--- a/drivers/staging/easycap/easycap_main.c
+++ b/drivers/staging/easycap/easycap_main.c
@@ -913,8 +913,6 @@ static void easycap_delete(struct kref *pkref)
         allocation_audio_struct = peasycap->allocation_audio_struct;
         registered_audio        = peasycap->registered_audio;
 
-        kfree(peasycap);
-
         if (0 <= kd && DONGLE_MANY > kd) {
                 if (mutex_lock_interruptible(&mutex_dongle)) {
                         SAY("ERROR: cannot down mutex_dongle\n");
@@ -929,6 +927,9 @@ static void easycap_delete(struct kref *pkref)
         } else {
                 SAY("ERROR: cannot purge dongle[].peasycap");
         }
+
+        kfree(peasycap);
+
 /*---------------------------------------------------------------------------*/
         SAY("%8i=video urbs    after all deletions\n", allocation_video_urb);
         SAY("%8i=video pages   after all deletions\n", allocation_video_page);