This is a note to let you know that I've just added the patch titled mmc: block: fix free of uninitialized 'idata->buf' to the 4.6-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mmc-block-fix-free-of-uninitialized-idata-buf.patch and it can be found in the queue-4.6 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From bfe5b1b1e013f7b1c0fd2ac3b3c8c380114b3fb9 Mon Sep 17 00:00:00 2001 From: Ville Viinikka <ville@xxxxxxxxxx> Date: Fri, 8 Jul 2016 18:27:02 +0300 Subject: mmc: block: fix free of uninitialized 'idata->buf' From: Ville Viinikka <ville@xxxxxxxxxx> commit bfe5b1b1e013f7b1c0fd2ac3b3c8c380114b3fb9 upstream. 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 <ville@xxxxxxxxxx> Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/mmc/card/block.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -352,8 +352,10 @@ static struct mmc_blk_ioc_data *mmc_blk_ 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) { Patches currently in stable-queue which might be from ville@xxxxxxxxxx are queue-4.6/mmc-block-fix-free-of-uninitialized-idata-buf.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html