From bfe5b1b1e013f7b1c0fd2ac3b3c8c380114b3fb9 Mon Sep 17 00:00:00 2001 From: Ville Viinikka Date: Fri, 8 Jul 2016 18:27:02 +0300 Subject: [PATCH] mmc: block: fix free of uninitialized 'idata->buf' Set 'idata->buf' to NULL so that it never gets returned without initialization. This fixes a bug where mmc_blk_ioctl_cmd() would free both 'idata' and 'idata->buf' but 'idata->buf' was returned uninitialized. Fixes: 1ff8950c0433 ("mmc: block: change to use kmalloc when copy data from userspace") Signed-off-by: Ville Viinikka Cc: Signed-off-by: Ulf Hansson --- drivers/mmc/card/block.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index e62fde3ac431..c13ba2ab19d6 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -355,8 +355,10 @@ static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user( goto idata_err; } - if (!idata->buf_bytes) + if (!idata->buf_bytes) { + idata->buf = NULL; return idata; + } idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL); if (!idata->buf) { -- 2.20.1