From mboxrd@z Thu Jan 1 00:00:00 1970 From: biju.das@bp.renesas.com (Biju Das) Date: Thu, 7 Nov 2019 08:32:43 +0000 Subject: [cip-dev] [PATCH 4.4.y-cip 74/83] mmc: tmio-mmc: fix bad pointer math In-Reply-To: <1573115572-13513-1-git-send-email-biju.das@bp.renesas.com> References: <1573115572-13513-1-git-send-email-biju.das@bp.renesas.com> Message-ID: <1573115572-13513-75-git-send-email-biju.das@bp.renesas.com> To: cip-dev@lists.cip-project.org List-Id: cip-dev.lists.cip-project.org From: Chris Brandt commit b5dd7985e8d3357ff9537c0be231190ab1a131fe upstream. commit 9c284c41c0886f09e75c323a16278b6d353b0b4a upstream. The existing code gives an incorrect pointer value. The buffer pointer 'buf' was of type unsigned short *, and 'count' was a number in bytes. A cast of buf should have been used. However, instead of casting, just change the code to use u32 pointers. Reported-by: Dan Carpenter Fixes: 8185e51f358a: ("mmc: tmio-mmc: add support for 32bit data port") Signed-off-by: Chris Brandt Reviewed-by: Geert Uytterhoeven Acked-by: Wolfram Sang Cc: Signed-off-by: Ulf Hansson Signed-off-by: Greg Kroah-Hartman Signed-off-by: Biju Das --- drivers/mmc/host/tmio_mmc_core.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c index 43209ea28..b6500a6 100644 --- a/drivers/mmc/host/tmio_mmc_core.c +++ b/drivers/mmc/host/tmio_mmc_core.c @@ -446,30 +446,29 @@ static void tmio_mmc_transfer_data(struct tmio_mmc_host *host, * Transfer the data */ if (host->pdata->flags & TMIO_MMC_32BIT_DATA_PORT) { - u8 data[4] = { }; + u32 data = 0; + u32 *buf32 = (u32 *)buf; if (is_read) - sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, (u32 *)buf, + sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, buf32, count >> 2); else - sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, (u32 *)buf, + sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, buf32, count >> 2); /* if count was multiple of 4 */ if (!(count & 0x3)) return; - buf8 = (u8 *)(buf + (count >> 2)); + buf32 += count >> 2; count %= 4; if (is_read) { - sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, - (u32 *)data, 1); - memcpy(buf8, data, count); + sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, &data, 1); + memcpy(buf32, &data, count); } else { - memcpy(data, buf8, count); - sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, - (u32 *)data, 1); + memcpy(&data, buf32, count); + sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, &data, 1); } return; -- 2.7.4