The patch below does not apply to the 4.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 6e92010b012116d10a3750c0406e3da67f274498 Mon Sep 17 00:00:00 2001

From: Gilad Ben-Yossef gilad@benyossef.com Date: Sun, 7 Jan 2018 12:14:25 +0000 Subject: [PATCH] staging: ccree: handle end of sg list gracefully

If we are asked for number of entries of an offset bigger than the sg list we should not crash.

Cc: stable@vger.kernel.org Signed-off-by: Gilad Ben-Yossef gilad@benyossef.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

diff --git a/drivers/staging/ccree/ssi_buffer_mgr.c b/drivers/staging/ccree/ssi_buffer_mgr.c index 78288ed75281..0f7126404a32 100644 --- a/drivers/staging/ccree/ssi_buffer_mgr.c +++ b/drivers/staging/ccree/ssi_buffer_mgr.c @@ -94,7 +94,7 @@ static unsigned int cc_get_sgl_nents(struct device *dev, { unsigned int nents = 0;

- while (nbytes) { + while (nbytes && sg_list) { if (sg_list->length) { nents++; /* get the number of bytes in the last entry */