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([2001:41d0:303:db6b::]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488f5813954sm1896615e9.3.2026.04.15.15.24.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Apr 2026 15:24:27 -0700 (PDT) From: Tristan Madani To: Johannes Berg Cc: linux-wireless@vger.kernel.org, b43-dev@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/2] wifi: b43: fix infinite loop from invalid hardware DMA RX slot Date: Wed, 15 Apr 2026 22:24:24 +0000 Message-ID: <20260415222425.1544638-2-tristmd@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260415222425.1544638-1-tristmd@gmail.com> References: <20260415222425.1544638-1-tristmd@gmail.com> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Tristan Madani b43_dma_rx() reads current_slot from hardware via get_current_rxslot(). If the value is >= ring->nr_slots, the B43_WARN_ON only warns but continues. The for loop then never terminates because next_slot() wraps modulo nr_slots and can never reach the out-of-range current_slot. Replace the B43_WARN_ON with an explicit bounds check that returns early when the hardware reports an invalid slot index. Fixes: e4d6b7951812 ("[B43]: add mac80211-based driver for modern BCM43xx devices") Signed-off-by: Tristan Madani --- drivers/net/wireless/broadcom/b43/dma.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/broadcom/b43/dma.c b/drivers/net/wireless/broadcom/b43/dma.c index XXXXXXX..XXXXXXX 100644 --- a/drivers/net/wireless/broadcom/b43/dma.c +++ b/drivers/net/wireless/broadcom/b43/dma.c @@ -1693,7 +1693,10 @@ void b43_dma_rx(struct b43_dmaring *ring) B43_WARN_ON(ring->tx); current_slot = ops->get_current_rxslot(ring); - B43_WARN_ON(!(current_slot >= 0 && current_slot < ring->nr_slots)); + if (!(current_slot >= 0 && current_slot < ring->nr_slots)) { + B43_WARN_ON(1); + return; + } slot = ring->current_slot; for (; slot != current_slot; slot = next_slot(ring, slot)) { -- 2.43.0