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device: Use overflow helpers for devm_kmalloc()

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Use the overflow helpers both in existing multiplication-using inlines as
well as the addition-overflow case in the core allocation routine.

Signed-off-by: Kees Cook <[email protected]>
This commit is contained in:
Kees Cook 2018-05-08 22:29:52 -07:00
commit 2509b561f7
2 changed files with 12 additions and 3 deletions
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7
drivers/base/devres.c
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@ -84,9 +84,14 @@ static struct devres_group * node_to_group(struct devres_node *node)
static __always_inline struct devres * alloc_dr(dr_release_t release,
size_t size, gfp_t gfp, int nid)
{
size_t tot_size = sizeof(struct devres) + size;
size_t tot_size;
struct devres *dr;
/* We must catch any near-SIZE_MAX cases that could overflow. */
if (unlikely(check_add_overflow(sizeof(struct devres), size,
&tot_size)))
return NULL;
dr = kmalloc_node_track_caller(tot_size, gfp, nid);
if (unlikely(!dr))
return NULL;