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lkdtm: Missing kmalloc check

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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>
This commit is contained in:
Vasyl Gomonovych 2017-11-23 17:00:42 +01:00 committed by Greg Kroah-Hartman
parent 148ade2c4d
commit 02543a4e96
1 changed files with 4 additions and 0 deletions
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4
drivers/misc/lkdtm_heap.c
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@ -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]);