| Message ID | 20230309150334.216760-2-james.clark@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | devres: Provide krealloc_array | expand |
On Thu, 9 Mar 2023 15:03:30 +0000 James Clark <james.clark@arm.com> wrote: > There is no krealloc_array equivalent in devres. Users would have to > do their own multiplication overflow check so provide one. > > Signed-off-by: James Clark <james.clark@arm.com> Trivial comment inline, but otherwise seems reasonable to me. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > --- > Documentation/driver-api/driver-model/devres.rst | 1 + > include/linux/device.h | 10 ++++++++++ > 2 files changed, 11 insertions(+) > > diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst > index 4249eb4239e0..8be086b3f829 100644 > --- a/Documentation/driver-api/driver-model/devres.rst > +++ b/Documentation/driver-api/driver-model/devres.rst > @@ -364,6 +364,7 @@ MEM > devm_kmalloc_array() > devm_kmemdup() > devm_krealloc() > + devm_krealloc_array() > devm_kstrdup() > devm_kstrdup_const() > devm_kvasprintf() > diff --git a/include/linux/device.h b/include/linux/device.h > index 1508e637bb26..0dd5956c8516 100644 > --- a/include/linux/device.h > +++ b/include/linux/device.h > @@ -223,6 +223,16 @@ static inline void *devm_kcalloc(struct device *dev, > { > return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO); > } > +static inline __realloc_size(3, 4) void * __must_check > +devm_krealloc_array(struct device *dev, void *p, size_t new_n, size_t new_size, gfp_t flags) > +{ > + size_t bytes; > + > + if (unlikely(check_mul_overflow(new_n, new_size, &bytes))) > + return NULL; For consistency with krealloc_array and other stuff in device.h that is of similar 'shape' add a blank line here. > + return devm_krealloc(dev, p, bytes, flags); > +} > + > void devm_kfree(struct device *dev, const void *p); > char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc; > const char *devm_kstrdup_const(struct device *dev, const char *s, gfp_t gfp);
diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst index 4249eb4239e0..8be086b3f829 100644 --- a/Documentation/driver-api/driver-model/devres.rst +++ b/Documentation/driver-api/driver-model/devres.rst @@ -364,6 +364,7 @@ MEM devm_kmalloc_array() devm_kmemdup() devm_krealloc() + devm_krealloc_array() devm_kstrdup() devm_kstrdup_const() devm_kvasprintf() diff --git a/include/linux/device.h b/include/linux/device.h index 1508e637bb26..0dd5956c8516 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -223,6 +223,16 @@ static inline void *devm_kcalloc(struct device *dev, { return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO); } +static inline __realloc_size(3, 4) void * __must_check +devm_krealloc_array(struct device *dev, void *p, size_t new_n, size_t new_size, gfp_t flags) +{ + size_t bytes; + + if (unlikely(check_mul_overflow(new_n, new_size, &bytes))) + return NULL; + return devm_krealloc(dev, p, bytes, flags); +} + void devm_kfree(struct device *dev, const void *p); char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc; const char *devm_kstrdup_const(struct device *dev, const char *s, gfp_t gfp);
There is no krealloc_array equivalent in devres. Users would have to do their own multiplication overflow check so provide one. Signed-off-by: James Clark <james.clark@arm.com> --- Documentation/driver-api/driver-model/devres.rst | 1 + include/linux/device.h | 10 ++++++++++ 2 files changed, 11 insertions(+)