lkdtm: Missing kmalloc check

Handling a possible memory allocation failure.

Signed-off-by: Vasyl Gomonovych <gomonovych@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/misc/lkdtm_heap.c b/drivers/misc/lkdtm_heap.c
index f5494a6d4be5..65026d7de130 100644
--- a/drivers/misc/lkdtm_heap.c
+++ b/drivers/misc/lkdtm_heap.c
@@ -16,6 +16,8 @@ void lkdtm_OVERWRITE_ALLOCATION(void)
 {
         size_t len = 1020;
         u32 *data = kmalloc(len, GFP_KERNEL);
+        if (!data)
+                return;
 
         data[1024 / sizeof(u32)] = 0x12345678;
         kfree(data);
@@ -33,6 +35,8 @@ void lkdtm_WRITE_AFTER_FREE(void)
         size_t offset = (len / sizeof(*base)) / 2;
 
         base = kmalloc(len, GFP_KERNEL);
+        if (!base)
+                return;
         pr_info("Allocated memory %p-%p\n", base, &base[offset * 2]);
         pr_info("Attempting bad write to freed memory at %p\n",
                 &base[offset]);