Messages in this thread | | | Date | Tue, 4 Aug 2020 12:58:15 +0300 | From | Sakari Ailus <> | Subject | Re: [PATCH] nvmem: core: add sanity check in nvmem_device_read() |
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Hi Bingbu,
Thank you for the patch.
On Tue, Aug 04, 2020 at 05:13:56PM +0800, Bingbu Cao wrote: > nvmem_device_read() could be called directly once nvmem device > registered, the sanity check should be done before call > nvmem_reg_read() as cell and sysfs read did now. > > Signed-off-by: Bingbu Cao <bingbu.cao@intel.com> > --- > drivers/nvmem/core.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c > index 927eb5f6003f..c9a77993f008 100644 > --- a/drivers/nvmem/core.c > +++ b/drivers/nvmem/core.c > @@ -1491,6 +1491,13 @@ int nvmem_device_read(struct nvmem_device *nvmem, > if (!nvmem) > return -EINVAL; > > + if (offset >= nvmem->size || bytes < nvmem->word_size) > + return 0; > + > + if (bytes + offset > nvmem->size) > + bytes = nvmem->size - offset;
The check is relevant for nvmem_device_write(), too.
There are also other ways to access nvmem devices such as nvmem_cell_read and others alike. Should they be considered as well?
> + > + bytes = round_down(bytes, nvmem->word_size); > rc = nvmem_reg_read(nvmem, offset, buf, bytes); > > if (rc)
-- Kind regards,
Sakari Ailus
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