| From | Julia Lawall <> | Subject | [PATCH 17/26] kcov: use array_size | Date | Fri, 23 Jun 2023 23:14:48 +0200 |
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Use array_size to protect against multiplication overflows.
The changes were done using the following Coccinelle semantic patch:
// <smpl> @@ expression E1, E2; constant C1, C2; identifier alloc = {vmalloc,vzalloc}; @@ ( alloc(C1 * C2,...) | alloc( - (E1) * (E2) + array_size(E1, E2) ,...) ) // </smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
--- kernel/kcov.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/kcov.c b/kernel/kcov.c index 84c717337df0..631444760644 100644 --- a/kernel/kcov.c +++ b/kernel/kcov.c @@ -900,7 +900,7 @@ void kcov_remote_start(u64 handle) /* Can only happen when in_task(). */ if (!area) { local_unlock_irqrestore(&kcov_percpu_data.lock, flags); - area = vmalloc(size * sizeof(unsigned long)); + area = vmalloc(array_size(size, sizeof(unsigned long))); if (!area) { kcov_put(kcov); return;
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