Hi Andrey,
On Mon, Apr 13, 2015 at 05:11:50AM -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 <[email protected]>
> ---
> drivers/firmware/socfpga.c | 26 ++++++++++++++++++++++----
> 1 file changed, 22 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/firmware/socfpga.c b/drivers/firmware/socfpga.c
> index a5dc607..75fb050 100644
> --- a/drivers/firmware/socfpga.c
> +++ b/drivers/firmware/socfpga.c
> @@ -321,14 +321,32 @@ 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) {
This code probably looks better when you change this loop to
while (size >= sizeof(uint32_t)){} followed by a if (size) {}
> - writel(*buf32, mgr->regs_data);
> + chunk_size = min(size, sizeof(uint32_t));
> + size -= chunk_size;
> +
> + if (likely(chunk_size == sizeof(uint32_t))) {
> + word = *(uint32_t *)(buffer + offset);
> + offset += sizeof(uint32_t);
> + } else {
> + word = buffer[offset++];
> + word <<= 8;
> + chunk_size--;
> +
> + while (chunk_size--) {
> + word |= buffer[offset++];
> + word <<= 8;
> + }
Isn't this the same as:
word = 0;
while (chunk_size--) {
word |= buffer[offset++];
word <<= 8;
}
Sascha
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