From 26d79b820b2773eabdc512c84d1152f0f631b2fc Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Wed, 20 Jun 2018 11:26:00 -0700 Subject: [PATCH] nvmem: rave-sp-eeprom: Remove VLA usage In the quest to remove all stack VLA usage from the kernel[1], this uses the maximum allocation size for the stack and adds a sanity check, similar to what has already be done for the regular rave-sp driver. [1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com Signed-off-by: Kees Cook Reviewed-by: Andrey Smirnov Tested-by: Andrey Smirnov Signed-off-by: Greg Kroah-Hartman --- drivers/nvmem/rave-sp-eeprom.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/nvmem/rave-sp-eeprom.c b/drivers/nvmem/rave-sp-eeprom.c index 50aeea6ec6cc..66699d44f73d 100644 --- a/drivers/nvmem/rave-sp-eeprom.c +++ b/drivers/nvmem/rave-sp-eeprom.c @@ -35,6 +35,7 @@ enum rave_sp_eeprom_header_size { RAVE_SP_EEPROM_HEADER_SMALL = 4U, RAVE_SP_EEPROM_HEADER_BIG = 5U, }; +#define RAVE_SP_EEPROM_HEADER_MAX RAVE_SP_EEPROM_HEADER_BIG #define RAVE_SP_EEPROM_PAGE_SIZE 32U @@ -97,9 +98,12 @@ static int rave_sp_eeprom_io(struct rave_sp_eeprom *eeprom, const unsigned int rsp_size = is_write ? sizeof(*page) - sizeof(page->data) : sizeof(*page); unsigned int offset = 0; - u8 cmd[cmd_size]; + u8 cmd[RAVE_SP_EEPROM_HEADER_MAX + sizeof(page->data)]; int ret; + if (WARN_ON(cmd_size > sizeof(cmd))) + return -EINVAL; + cmd[offset++] = eeprom->address; cmd[offset++] = 0; cmd[offset++] = type;