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Harding" To: Kalle Valo Cc: "Tobin C. Harding" , kernel-hardening@lists.openwall.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Tycho Andersen , Kees Cook , "Gustavo A. R. Silva" Subject: [PATCH] rsi: Remove stack VLA usage Date: Fri, 9 Mar 2018 17:38:13 +1100 Message-Id: <1520577493-24603-1-git-send-email-me@tobin.cc> X-Mailer: git-send-email 2.7.4 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1594441103492436943?= X-GMAIL-MSGID: =?utf-8?q?1594441103492436943?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: The kernel would like to have all stack VLA usage removed[1]. rsi uses a VLA based on 'blksize'. Elsewhere in the SDIO code maximum block size is defined using a magic number. We can use a pre-processor defined constant and declare the array to maximum size. We add a check before accessing the array in case of programmer error. [1]: https://lkml.org/lkml/2018/3/7/621 Signed-off-by: Tobin C. Harding --- drivers/net/wireless/rsi/rsi_91x_hal.c | 13 +++++++------ drivers/net/wireless/rsi/rsi_91x_sdio.c | 9 +++++++-- 2 files changed, 14 insertions(+), 8 deletions(-) diff --git a/drivers/net/wireless/rsi/rsi_91x_hal.c b/drivers/net/wireless/rsi/rsi_91x_hal.c index 1176de646942..839ebdd602df 100644 --- a/drivers/net/wireless/rsi/rsi_91x_hal.c +++ b/drivers/net/wireless/rsi/rsi_91x_hal.c @@ -641,7 +641,7 @@ static int ping_pong_write(struct rsi_hw *adapter, u8 cmd, u8 *addr, u32 size) u32 cmd_addr; u16 cmd_resp, cmd_req; u8 *str; - int status; + int status, ret; if (cmd == PING_WRITE) { cmd_addr = PING_BUFFER_ADDRESS; @@ -655,12 +655,13 @@ static int ping_pong_write(struct rsi_hw *adapter, u8 cmd, u8 *addr, u32 size) str = "PONG_VALID"; } - status = hif_ops->load_data_master_write(adapter, cmd_addr, size, + ret = hif_ops->load_data_master_write(adapter, cmd_addr, size, block_size, addr); - if (status) { - rsi_dbg(ERR_ZONE, "%s: Unable to write blk at addr %0x\n", - __func__, *addr); - return status; + if (ret) { + if (ret != -EINVAL) + rsi_dbg(ERR_ZONE, "%s: Unable to write blk at addr %0x\n", + __func__, *addr); + return ret; } status = bl_cmd(adapter, cmd_req, cmd_resp, str); diff --git a/drivers/net/wireless/rsi/rsi_91x_sdio.c b/drivers/net/wireless/rsi/rsi_91x_sdio.c index b0cf41195051..b766578b591a 100644 --- a/drivers/net/wireless/rsi/rsi_91x_sdio.c +++ b/drivers/net/wireless/rsi/rsi_91x_sdio.c @@ -20,6 +20,8 @@ #include "rsi_common.h" #include "rsi_hal.h" +#define RSI_MAX_BLOCK_SIZE 256 + /** * rsi_sdio_set_cmd52_arg() - This function prepares cmd 52 read/write arg. * @rw: Read/write @@ -362,7 +364,7 @@ static int rsi_setblocklength(struct rsi_hw *adapter, u32 length) rsi_dbg(INIT_ZONE, "%s: Setting the block length\n", __func__); status = sdio_set_block_size(dev->pfunction, length); - dev->pfunction->max_blksize = 256; + dev->pfunction->max_blksize = RSI_MAX_BLOCK_SIZE; adapter->block_size = dev->pfunction->max_blksize; rsi_dbg(INFO_ZONE, @@ -567,9 +569,12 @@ static int rsi_sdio_load_data_master_write(struct rsi_hw *adapter, { u32 num_blocks, offset, i; u16 msb_address, lsb_address; - u8 temp_buf[block_size]; + u8 temp_buf[RSI_MAX_BLOCK_SIZE]; int status; + if (block_size > RSI_MAX_BLOCK_SIZE) + return -EINVAL; + num_blocks = instructions_sz / block_size; msb_address = base_address >> 16; -- 2.7.4