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| author | Kees Cook <keescook@chromium.org> | 2018-05-09 07:29:52 +0200 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2018-06-05 21:16:51 +0200 |
| commit | 2509b561f7c6599907c08cb364c86b8c45466e4f (patch) | |
| tree | 4d9002abaf08e2ebcda9d313a2d825aeb198d102 /include | |
| parent | mm: Use overflow helpers in kvmalloc() (diff) | |
| download | linux-2509b561f7c6599907c08cb364c86b8c45466e4f.tar.xz linux-2509b561f7c6599907c08cb364c86b8c45466e4f.zip | |
device: Use overflow helpers for devm_kmalloc()
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 <keescook@chromium.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/device.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/include/linux/device.h b/include/linux/device.h index 477956990f5e..897efa647203 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -25,6 +25,7 @@ #include <linux/ratelimit.h> #include <linux/uidgid.h> #include <linux/gfp.h> +#include <linux/overflow.h> #include <asm/device.h> struct device; @@ -668,9 +669,12 @@ static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp) static inline void *devm_kmalloc_array(struct device *dev, size_t n, size_t size, gfp_t flags) { - if (size != 0 && n > SIZE_MAX / size) + size_t bytes; + + if (unlikely(check_mul_overflow(n, size, &bytes))) return NULL; - return devm_kmalloc(dev, n * size, flags); + + return devm_kmalloc(dev, bytes, flags); } static inline void *devm_kcalloc(struct device *dev, size_t n, size_t size, gfp_t flags) |