linux-kernel - [PATCH] mm/gup: Fix memory leaks in __gup_benchmark

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Date:   Fri, 22 Nov 2019 16:41:15 -0600
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     emamd001@....edu, Navid Emamdoost <navid.emamdoost@...il.com>
Subject: [PATCH] mm/gup: Fix memory leaks in __gup_benchmark_ioctl

In the implementation of __gup_benchmark_ioctl() memory is leaked if the
passed cmd is invalid. Release pages before returning -1.

Fixes: 714a3a1ebafe ("mm/gup_benchmark.c: add additional pinning methods")
Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
 mm/gup_benchmark.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/mm/gup_benchmark.c b/mm/gup_benchmark.c
index 7dd602d7f8db..33ede5727523 100644
--- a/mm/gup_benchmark.c
+++ b/mm/gup_benchmark.c
@@ -23,7 +23,7 @@ static int __gup_benchmark_ioctl(unsigned int cmd,
 		struct gup_benchmark *gup)
 {
 	ktime_t start_time, end_time;
-	unsigned long i, nr_pages, addr, next;
+	unsigned long i, j, nr_pages, addr, next;
 	int nr;
 	struct page **pages;
 
@@ -63,6 +63,12 @@ static int __gup_benchmark_ioctl(unsigned int cmd,
 					    NULL);
 			break;
 		default:
+			for (j = 0; j < i; j++) {
+				if (!pages[j])
+					break;
+				put_page(pages[j]);
+			}
+			kvfree(pages);
 			return -1;
 		}
 
-- 
2.17.1