tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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 <pengpeng@iscas.ac.cn>
Link: https://patch.msgid.link/20260326142033.82297-1-pengpeng@iscas.ac.cn
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

authored by

Pengpeng Hou and committed by
Paolo Abeni 30fe3f5f 2884bf72

+3
+3
drivers/nfc/pn533/uart.c
··· 211 211 212 212 timer_delete(&dev->cmd_timeout); 213 213 for (i = 0; i < count; i++) { 214 + if (unlikely(!skb_tailroom(dev->recv_skb))) 215 + skb_trim(dev->recv_skb, 0); 216 + 214 217 skb_put_u8(dev->recv_skb, *data++); 215 218 if (!pn532_uart_rx_is_frame(dev->recv_skb)) 216 219 continue;