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Tue, 07 Apr 2026 10:22:53 -0700 (PDT) From: Sebastian Alba Vives To: yilun.xu@linux.intel.com, gregkh@linuxfoundation.org Cc: linux-fpga@vger.kernel.org, conor.dooley@microchip.com, mdf@kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Sebastian Alba Vives Subject: [PATCH v4 3/3] fpga: microchip-spi: fix OOB read in mpf_ops_parse_header() Date: Tue, 7 Apr 2026 11:22:17 -0600 Message-ID: <20260407172230.40775-3-sebasjosue84@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260407172230.40775-1-sebasjosue84@gmail.com> References: <20260407172230.40775-1-sebasjosue84@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit mpf_ops_parse_header() reads header_size at MPF_HEADER_SIZE_OFFSET (24) without first checking that count is large enough, leading to an out-of-bounds read if the buffer is smaller than 25 bytes. Additionally, when header_size is zero, the expression *(buf + header_size - 1) reads one byte before the buffer start. Since a zero header_size cannot be resolved by providing a larger buffer, return -EINVAL instead of falling through. Fixes: 5f8d4a9008307 ("fpga: microchip-spi: add Microchip MPF FPGA manager") Cc: stable@vger.kernel.org Signed-off-by: Sebastian Alba Vives --- Changes in v4: - Reduce to two minimal fixes only: minimum count check before reading header_size, and -EINVAL for zero header_size. Drop redundant block loop checks — the pre-loop bounds extension already ensures all block offsets are within count. Suggested by Xu Yilun. Changes in v3: - Add overflow check for 32-bit in component size loop. Changes in v2: - Return -EINVAL for header_size == 0, -EAGAIN in block loop, add count check before MPF_HEADER_SIZE_OFFSET read. --- drivers/fpga/microchip-spi.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/fpga/microchip-spi.c b/drivers/fpga/microchip-spi.c index 6134cea..dca1a5d 100644 --- a/drivers/fpga/microchip-spi.c +++ b/drivers/fpga/microchip-spi.c @@ -115,7 +115,13 @@ static int mpf_ops_parse_header(struct fpga_manager *mgr, return -EINVAL; } + if (count < MPF_HEADER_SIZE_OFFSET + 1) + return -EINVAL; + header_size = *(buf + MPF_HEADER_SIZE_OFFSET); + if (!header_size) + return -EINVAL; + if (header_size > count) { info->header_size = header_size; return -EAGAIN; -- 2.43.0