linux-kernel - [PATCH 5.15 125/132] net: atlantic: add check for MAX_SKB

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Date:   Mon, 23 May 2022 19:05:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Aashay Shringarpure <aashay@...gle.com>,
        Yi Chou <yich@...gle.com>,
        Shervin Oloumi <enlightened@...gle.com>,
        Grant Grundler <grundler@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 125/132] net: atlantic: add check for MAX_SKB_FRAGS

From: Grant Grundler <grundler@...omium.org>

[ Upstream commit 6aecbba12b5c90b26dc062af3b9de8c4b3a2f19f ]

Enforce that the CPU can not get stuck in an infinite loop.

Reported-by: Aashay Shringarpure <aashay@...gle.com>
Reported-by: Yi Chou <yich@...gle.com>
Reported-by: Shervin Oloumi <enlightened@...gle.com>
Signed-off-by: Grant Grundler <grundler@...omium.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/aquantia/atlantic/aq_ring.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_ring.c b/drivers/net/ethernet/aquantia/atlantic/aq_ring.c
index 339efdfb1d49..e9c6f1fa0b1a 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_ring.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_ring.c
@@ -362,6 +362,7 @@ int aq_ring_rx_clean(struct aq_ring_s *self,
 			continue;
 
 		if (!buff->is_eop) {
+			unsigned int frag_cnt = 0U;
 			buff_ = buff;
 			do {
 				bool is_rsc_completed = true;
@@ -370,6 +371,8 @@ int aq_ring_rx_clean(struct aq_ring_s *self,
 					err = -EIO;
 					goto err_exit;
 				}
+
+				frag_cnt++;
 				next_ = buff_->next,
 				buff_ = &self->buff_ring[next_];
 				is_rsc_completed =
@@ -377,7 +380,8 @@ int aq_ring_rx_clean(struct aq_ring_s *self,
 							    next_,
 							    self->hw_head);
 
-				if (unlikely(!is_rsc_completed)) {
+				if (unlikely(!is_rsc_completed) ||
+						frag_cnt > MAX_SKB_FRAGS) {
 					err = 0;
 					goto err_exit;
 				}
-- 
2.35.1