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NFC: pn533: bound the UART receive buffer

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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: c656aa4c27 ("nfc: pn533: add UART phy driver")
Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
Link: https://patch.msgid.link/20260326142033.82297-1-pengpeng@iscas.ac.cn
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Pengpeng Hou
2026-03-26 22:20:33 +08:00
committed by Paolo Abeni
parent 2884bf72fb
commit 30fe3f5f64
1 changed files with 3 additions and 0 deletions
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3
drivers/nfc/pn533/uart.c
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@@ -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;