On Tue, Apr 21, 2015 at 5:28 AM, Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> wrote:
> Hi Andrey,
>
> On Mon, Apr 20, 2015 at 05:37:43AM -0700, Andrey Smirnov wrote:
>> Fix a bug in fpgamgr_program_write_buf() where .rbf file whose length
>> is not a multiple of 4 would cause an integer overflow which would
>> result in infinite loop.
>>
>> Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
>> ---
>> drivers/firmware/socfpga.c | 24 +++++++++++++++++++-----
>> 1 file changed, 19 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/firmware/socfpga.c b/drivers/firmware/socfpga.c
>> index a5dc607..71f260f 100644
>> --- a/drivers/firmware/socfpga.c
>> +++ b/drivers/firmware/socfpga.c
>> @@ -321,14 +321,28 @@ static int fpgamgr_program_write_buf(struct firmware_handler *fh, const void *bu
>> size_t size)
>> {
>> struct fpgamgr *mgr = container_of(fh, struct fpgamgr, fh);
>> - const uint32_t *buf32 = buf;
>> + const uint8_t *buffer = buf;
>> + uint32_t word;
>> + size_t chunk_size;
>> + size_t offset = 0;
>>
>> /* write to FPGA Manager AXI data */
>> - while (size) {
>> - writel(*buf32, mgr->regs_data);
>> - readl(mgr->regs + FPGAMGRREGS_MON_GPIO_EXT_PORTA_ADDRESS);
>> - buf32++;
>> + while (size >= sizeof(uint32_t)) {
>> size -= sizeof(uint32_t);
>> +
>> + word = *(uint32_t *)(buffer + offset);
>> + offset += sizeof(uint32_t);
>> +
>> + writel(word, mgr->regs_data);
>> + readl(mgr->regs + FPGAMGRREGS_MON_GPIO_EXT_PORTA_ADDRESS);
>> + }
>
> Can't the original loop body stay like it was before?
I haven't thought of that, but yeah it is a good idea. I will do that.
>
>> +
>> + if (size) {
>> + word = 0;
>> + while (chunk_size--) {
>
> chunk_size is never initialized.
>
>> + word |= buffer[offset++];
>> + word <<= 8;
>
> The remaining data is never written.
Hmm, I could have sworn I tested this patch, but you are right this
code cannot be correct. I'll update it and test the code more
thoroughly this time.
>
> Sascha
>
> --
> Pengutronix e.K. | |
> Industrial Linux Solutions | http://www.pengutronix.de/ |
> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
> Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
_______________________________________________
barebox mailing list
barebox@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/barebox
