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Commit 02543a4e authored by Vasyl Gomonovych's avatar Vasyl Gomonovych Committed by Greg Kroah-Hartman
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lkdtm: Missing kmalloc check 



Handling a possible memory allocation failure.

Signed-off-by: default avatarVasyl Gomonovych <gomonovych@gmail.com>
Acked-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 148ade2c

drivers/misc/lkdtm_heap.c

+4 −0
Original line number Diff line number Diff line
@@ -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]);