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Tue, 22 Sep 2026 14:58:53 -0700 (PDT) Received: from localhost.localdomain ([109.195.90.36]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-3a62f53b3d5sm1974651fa.40.2026.09.22.14.58.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Sep 2026 14:58:52 -0700 (PDT) From: Vladan Kalaba To: gregkh@linuxfoundation.org Cc: ovidiu.panait.oss@gmail.com, gustavopiazdasilva2102@gmail.com, error27@gmail.com, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org, Vladan Kalaba , stable@vger.kernel.org Subject: [PATCH] staging: axis-fifo: fix integer underflow in tx_fifo_depth Date: Tue, 22 Sep 2026 23:58:48 +0200 Message-ID: <20260922215849.16739-1-vladan.kalaba@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Fix integer underflow if tx_fifo_depth < 4 in axis-fifo.c due to check in axis_fifo_write() subtracting 4. Fixes: 52ff2b840bc7 ("staging: axis-fifo: fix maximum TX packet length check") Cc: stable@vger.kernel.org Signed-off-by: Vladan Kalaba --- drivers/staging/axis-fifo/axis-fifo.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/staging/axis-fifo/axis-fifo.c b/drivers/staging/axis-fifo/axis-fifo.c index 7bb35e11d1dd..066124122caa 100644 --- a/drivers/staging/axis-fifo/axis-fifo.c +++ b/drivers/staging/axis-fifo/axis-fifo.c @@ -413,6 +413,11 @@ static int axis_fifo_parse_dt(struct axis_fifo *fifo) if (ret) return ret; + if (fifo->tx_fifo_depth < 4) { + dev_err(fifo->dt_device, "tx_fifo_depth must be >= 4\n"); + return -EINVAL; + } + ret = of_property_read_u32(node, "xlnx,use-rx-data", &fifo->has_rx_fifo); if (ret) -- 2.53.0