From a7c46c0c0e3d62f2764cd08b90934cd2aaaf8545 Mon Sep 17 00:00:00 2001
From: Navid Emamdoost <navid.emamdoost@gmail.com>
Date: Sat, 4 Jan 2020 13:00:12 -0800
Subject: [PATCH] mm/gup: fix memory leak in __gup_benchmark_ioctl
In the implementation of __gup_benchmark_ioctl() the allocated pages
should be released before returning in case of an invalid cmd. Release
pages via kvfree().
[akpm@linux-foundation.org: rework code flow, return -EINVAL rather than -1]
Link: http://lkml.kernel.org/r/20191211174653.4102-1-navid.emamdoost@gmail.com
Fixes: 714a3a1ebafe ("mm/gup_benchmark.c: add additional pinning methods")
Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
mm/gup_benchmark.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/mm/gup_benchmark.c b/mm/gup_benchmark.c
index 7dd602d7f8db7..ad9d5b1c44739 100644
--- a/mm/gup_benchmark.c
+++ b/mm/gup_benchmark.c
@@ -26,6 +26,7 @@ static int __gup_benchmark_ioctl(unsigned int cmd,
unsigned long i, nr_pages, addr, next;
int nr;
struct page **pages;
+ int ret = 0;
if (gup->size > ULONG_MAX)
return -EINVAL;
@@ -63,7 +64,9 @@ static int __gup_benchmark_ioctl(unsigned int cmd,
NULL);
break;
default:
- return -1;
+ kvfree(pages);
+ ret = -EINVAL;
+ goto out;
}
if (nr <= 0)
@@ -85,7 +88,8 @@ static int __gup_benchmark_ioctl(unsigned int cmd,
gup->put_delta_usec = ktime_us_delta(end_time, start_time);
kvfree(pages);
- return 0;
+out:
+ return ret;
}
static long gup_benchmark_ioctl(struct file *filep, unsigned int cmd,
--
GitLab