From d39bf40e55e666b5905fdbd46a0dced030ce87be Mon Sep 17 00:00:00 2001
From: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Date: Tue, 12 Oct 2021 13:55:19 -0400
Subject: [PATCH 1/1] IB/qib: Protect from buffer overflow in struct
 qib_user_sdma_pkt fields
Git-commit: d39bf40e55e666b5905fdbd46a0dced030ce87be
Patch-mainline: v5.15
References: git-fixes

Overflowing either addrlimit or bytes_togo can allow userspace to trigger
a buffer overflow of kernel memory. Check for overflows in all the places
doing math on user controlled buffers.

Fixes: f931551bafe1 ("IB/qib: Add new qib driver for QLogic PCIe InfiniBand adapters")
Link: https://lore.kernel.org/r/20211012175519.7298.77738.stgit@awfm-01.cornelisnetworks.com
Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Nicolas Morey-Chaisemartin <nmoreychaisemartin@suse.com>
---
 drivers/infiniband/hw/qib/qib_user_sdma.c | 33 ++++++++++++++++-------
 1 file changed, 23 insertions(+), 10 deletions(-)

diff --git a/drivers/infiniband/hw/qib/qib_user_sdma.c b/drivers/infiniband/hw/qib/qib_user_sdma.c
index a67599b5a550..ac11943a5ddb 100644
--- a/drivers/infiniband/hw/qib/qib_user_sdma.c
+++ b/drivers/infiniband/hw/qib/qib_user_sdma.c
@@ -602,7 +602,7 @@ done:
 /*
  * How many pages in this iovec element?
  */
-static int qib_user_sdma_num_pages(const struct iovec *iov)
+static size_t qib_user_sdma_num_pages(const struct iovec *iov)
 {
 	const unsigned long addr  = (unsigned long) iov->iov_base;
 	const unsigned long  len  = iov->iov_len;
@@ -658,7 +658,7 @@ static void qib_user_sdma_free_pkt_frag(struct device *dev,
 static int qib_user_sdma_pin_pages(const struct qib_devdata *dd,
 				   struct qib_user_sdma_queue *pq,
 				   struct qib_user_sdma_pkt *pkt,
-				   unsigned long addr, int tlen, int npages)
+				   unsigned long addr, int tlen, size_t npages)
 {
 	struct page *pages[8];
 	int i, j;
@@ -722,7 +722,7 @@ static int qib_user_sdma_pin_pkt(const struct qib_devdata *dd,
 	unsigned long idx;
 
 	for (idx = 0; idx < niov; idx++) {
-		const int npages = qib_user_sdma_num_pages(iov + idx);
+		const size_t npages = qib_user_sdma_num_pages(iov + idx);
 		const unsigned long addr = (unsigned long) iov[idx].iov_base;
 
 		ret = qib_user_sdma_pin_pages(dd, pq, pkt, addr,
@@ -824,8 +824,8 @@ static int qib_user_sdma_queue_pkts(const struct qib_devdata *dd,
 		unsigned pktnw;
 		unsigned pktnwc;
 		int nfrags = 0;
-		int npages = 0;
-		int bytes_togo = 0;
+		size_t npages = 0;
+		size_t bytes_togo = 0;
 		int tiddma = 0;
 		int cfur;
 
@@ -885,7 +885,11 @@ static int qib_user_sdma_queue_pkts(const struct qib_devdata *dd,
 
 			npages += qib_user_sdma_num_pages(&iov[idx]);
 
-			bytes_togo += slen;
+			if (check_add_overflow(bytes_togo, slen, &bytes_togo) ||
+			    bytes_togo > type_max(typeof(pkt->bytes_togo))) {
+				ret = -EINVAL;
+				goto free_pbc;
+			}
 			pktnwc += slen >> 2;
 			idx++;
 			nfrags++;
@@ -904,8 +908,7 @@ static int qib_user_sdma_queue_pkts(const struct qib_devdata *dd,
 		}
 
 		if (frag_size) {
-			int tidsmsize, n;
-			size_t pktsize;
+			size_t tidsmsize, n, pktsize, sz, addrlimit;
 
 			n = npages*((2*PAGE_SIZE/frag_size)+1);
 			pktsize = struct_size(pkt, addr, n);
@@ -923,14 +926,24 @@ static int qib_user_sdma_queue_pkts(const struct qib_devdata *dd,
 			else
 				tidsmsize = 0;
 
-			pkt = kmalloc(pktsize+tidsmsize, GFP_KERNEL);
+			if (check_add_overflow(pktsize, tidsmsize, &sz)) {
+				ret = -EINVAL;
+				goto free_pbc;
+			}
+			pkt = kmalloc(sz, GFP_KERNEL);
 			if (!pkt) {
 				ret = -ENOMEM;
 				goto free_pbc;
 			}
 			pkt->largepkt = 1;
 			pkt->frag_size = frag_size;
-			pkt->addrlimit = n + ARRAY_SIZE(pkt->addr);
+			if (check_add_overflow(n, ARRAY_SIZE(pkt->addr),
+					       &addrlimit) ||
+			    addrlimit > type_max(typeof(pkt->addrlimit))) {
+				ret = -EINVAL;
+				goto free_pbc;
+			}
+			pkt->addrlimit = addrlimit;
 
 			if (tiddma) {
 				char *tidsm = (char *)pkt + pktsize;
-- 
2.38.0.1.gee35aeee4b76