From: Dan Carpenter <dan.carpenter@oracle.com>
To: kernel-janitors@vger.kernel.org
Subject: [patch v2] staging: android: ion: Fix error handling in ion_query_heaps()
Date: Thu, 13 Oct 2016 12:55:08 +0000 [thread overview]
Message-ID: <20161013125508.GA12868@mwanda> (raw)
If the copy_to_user() fails we should unlock and return directly without
updating "cnt". Also the return value should be -EFAULT instead of the
number of bytes remaining.
Fixes: 02b23803c6af ("staging: android: ion: Add ioctl to query available heaps")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
v2: a more complete fix
diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index 396ded5..209a8f7 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -1187,8 +1187,10 @@ int ion_query_heaps(struct ion_client *client, struct ion_heap_query *query)
hdata.type = heap->type;
hdata.heap_id = heap->id;
- ret = copy_to_user(&buffer[cnt],
- &hdata, sizeof(hdata));
+ if (copy_to_user(&buffer[cnt], &hdata, sizeof(hdata))) {
+ ret = -EFAULT;
+ goto out;
+ }
cnt++;
if (cnt >= max_cnt)
reply other threads:[~2016-10-13 12:55 UTC|newest]
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