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mfd: rave-sp: Remove VLA 

As part of the effort to remove VLAs from the kernel[1], this creates
constants for the checksum lengths of CCITT and 8B2C and changes
crc_calculated to be the maximum size of a checksum.

https://lkml.org/lkml/2018/3/7/621

Signed-off-by: Kyle Spiers <ksspiers@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Kyle Spiers 2018-04-27 15:30:23 -07:00 committed by Lee Jones
parent ac1886165c
commit 7169483ce4
1 changed files with 9 additions and 2 deletions
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11
drivers/mfd/rave-sp.c
View File

@ -45,7 +45,9 @@
#define RAVE_SP_DLE 0x10
#define RAVE_SP_MAX_DATA_SIZE 64
#define RAVE_SP_CHECKSUM_SIZE 2 /* Worst case scenario on RDU2 */
#define RAVE_SP_CHECKSUM_8B2C 1
#define RAVE_SP_CHECKSUM_CCITT 2
#define RAVE_SP_CHECKSUM_SIZE RAVE_SP_CHECKSUM_CCITT
/*
* We don't store STX, ETX and unescaped bytes, so Rx is only
* DATA + CSUM
@ -449,7 +451,12 @@ static void rave_sp_receive_frame(struct rave_sp *sp,
const size_t payload_length = length - checksum_length;
const u8 *crc_reported = &data[payload_length];
struct device *dev = &sp->serdev->dev;
u8 crc_calculated[checksum_length];
u8 crc_calculated[RAVE_SP_CHECKSUM_SIZE];
if (unlikely(checksum_length > sizeof(crc_calculated))) {
dev_warn(dev, "Checksum too long, dropping\n");
return;
}
print_hex_dump_debug("rave-sp rx: ", DUMP_PREFIX_NONE,
16, 1, data, length, false);