lkml.org 
[lkml]   [2018]   [Jan]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH] tee: shm: Potential NULL dereference calling tee_shm_register()
get_user_pages_fast() can return zero in certain error paths.  We should
handle that or else it means we accidentally return ERR_PTR(0) which is
NULL instead of an error pointer. The callers are not expecting that
and will crash with a NULL dereference.

Fixes: 033ddf12bcf5 ("tee: add register user memory")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
index 04e1b8b37046..cdeb4156acda 100644
--- a/drivers/tee/tee_shm.c
+++ b/drivers/tee/tee_shm.c
@@ -283,7 +283,7 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
if (rc > 0)
shm->num_pages = rc;
if (rc != num_pages) {
- if (rc > 0)
+ if (rc >= 0)
rc = -ENOMEM;
ret = ERR_PTR(rc);
goto err;
\
 
 \ /
  Last update: 2018-01-06 10:23    [W:0.029 / U:1.744 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site