[PATCH 1/2] lkdtm: fix memory leak of val

From: Sudip Mukherjee
Date: Tue Apr 05 2016 - 13:11:22 EST


This case is supposed to read from a page after after it is freed, but
it missed freeing val if we are not able to get a free page.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@xxxxxxxxxxxxxxx>
---
drivers/misc/lkdtm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c
index 5f1a36b..2f0b022 100644
--- a/drivers/misc/lkdtm.c
+++ b/drivers/misc/lkdtm.c
@@ -498,12 +498,13 @@ static void lkdtm_do_action(enum ctype which)
}
case CT_READ_BUDDY_AFTER_FREE: {
unsigned long p = __get_free_page(GFP_KERNEL);
- int saw, *val = kmalloc(1024, GFP_KERNEL);
+ int saw, *val;
int *base;

if (!p)
break;

+ val = kmalloc(1024, GFP_KERNEL);
if (!val)
break;

--
1.9.1