From 1903971a8a74dee50a7b57b3b3ed0e84b5293b8c Mon Sep 17 00:00:00 2001 From: Grant Grundler Date: Mon, 9 May 2022 19:28:25 -0700 Subject: [PATCH] net: atlantic: add check for MAX_SKB_FRAGS Enforce that the CPU can not get stuck in an infinite loop. Reported-by: Aashay Shringarpure Reported-by: Yi Chou Reported-by: Shervin Oloumi Signed-off-by: Grant Grundler Signed-off-by: David S. Miller --- 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 bc1952131799e..8201ce7adb777 100644 --- a/drivers/net/ethernet/aquantia/atlantic/aq_ring.c +++ b/drivers/net/ethernet/aquantia/atlantic/aq_ring.c @@ -363,6 +363,7 @@ 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; @@ -371,6 +372,8 @@ 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 = @@ -378,7 +381,8 @@ 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; } -- 2.39.5