From: Pengpeng Hou Date: Thu, 26 Mar 2026 14:20:33 +0000 (+0800) Subject: NFC: pn533: bound the UART receive buffer X-Git-Tag: v7.0-rc7~28^2~24 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=30fe3f5f6494f827d812ff179f295a8e532709d6;p=thirdparty%2Fkernel%2Flinux.git NFC: pn533: bound the UART receive buffer pn532_receive_buf() appends every incoming byte to dev->recv_skb and only resets the buffer after pn532_uart_rx_is_frame() recognizes a complete frame. A continuous stream of bytes without a valid PN532 frame header therefore keeps growing the skb until skb_put_u8() hits the tail limit. Drop the accumulated partial frame once the fixed receive buffer is full so malformed UART traffic cannot grow the skb past PN532_UART_SKB_BUFF_LEN. Fixes: c656aa4c27b1 ("nfc: pn533: add UART phy driver") Signed-off-by: Pengpeng Hou Link: https://patch.msgid.link/20260326142033.82297-1-pengpeng@iscas.ac.cn Signed-off-by: Paolo Abeni --- diff --git a/drivers/nfc/pn533/uart.c b/drivers/nfc/pn533/uart.c index 6d2f520a5bc8d..1b82b7b2a5fae 100644 --- a/drivers/nfc/pn533/uart.c +++ b/drivers/nfc/pn533/uart.c @@ -211,6 +211,9 @@ static size_t pn532_receive_buf(struct serdev_device *serdev, timer_delete(&dev->cmd_timeout); for (i = 0; i < count; i++) { + if (unlikely(!skb_tailroom(dev->recv_skb))) + skb_trim(dev->recv_skb, 0); + skb_put_u8(dev->recv_skb, *data++); if (!pn532_uart_rx_is_frame(dev->recv_skb)) continue;