On 24/06/2020 8.55, Vinod Koul wrote:
> On 19-06-20, 17:43, Gustavo A. R. Silva wrote:
>> Make use of the struct_size() helper instead of an open-coded version
>> in order to avoid any potential type mistakes.
>>
>> This code was detected with the help of Coccinelle and, audited and
>> fixed manually.
>>
>> Addresses-KSPP-ID: https://github.com/KSPP/linux/issues/83
>> Signed-off-by: Gustavo A. R. Silva <[email protected]>
>> ---
>> drivers/dma/ti/k3-udma.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
>> index 0d5fb154b8e2..411c54b86ba8 100644
>> --- a/drivers/dma/ti/k3-udma.c
>> +++ b/drivers/dma/ti/k3-udma.c
>> @@ -2209,7 +2209,7 @@ udma_prep_slave_sg_pkt(struct udma_chan *uc, struct
>> scatterlist *sgl,
>> u32 ring_id;
>> unsigned int i;
>>
>> - d = kzalloc(sizeof(*d) + sglen * sizeof(d->hwdesc[0]), GFP_NOWAIT);
>> + d = kzalloc(struct_size(d, hwdesc, sglen), GFP_NOWAIT);
>
> struct_size() is a * b + c but here we need, a + b * c.. the trailing
> struct is N times here..
Yes, that's correct.
>
>
>> if (!d)
>> return NULL;
>>
>> @@ -2525,7 +2525,7 @@ udma_prep_dma_cyclic_pkt(struct udma_chan *uc,
>> dma_addr_t buf_addr,
>> if (period_len >= SZ_4M)
>> return NULL;
>>
>> - d = kzalloc(sizeof(*d) + periods * sizeof(d->hwdesc[0]), GFP_NOWAIT);
>> + d = kzalloc(struct_size(d, hwdesc, periods), GFP_NOWAIT);
>> if (!d)
>> return NULL;
>>
>> --
>> 2.27.0
>
- Péter
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
