net: caif: Use scnprintf() for avoiding potential buffer overflow
Since snprintf() returns the would-be-output size instead of the actual output size, the succeeding calls may go beyond the given buffer limit. Fix it by replacing with scnprintf(). Cc: "David S . Miller" <davem@davemloft.net> Cc: netdev@vger.kernel.org Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -141,29 +141,29 @@ static ssize_t dbgfs_state(struct file *file, char __user *user_buf,
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return 0;
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/* Print out debug information. */
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len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"CAIF SPI debug information:\n");
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len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"CAIF SPI debug information:\n");
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len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), FLAVOR);
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len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), FLAVOR);
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len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"STATE: %d\n", cfspi->dbg_state);
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len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Previous CMD: 0x%x\n", cfspi->pcmd);
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len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Current CMD: 0x%x\n", cfspi->cmd);
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len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Previous TX len: %d\n", cfspi->tx_ppck_len);
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len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Previous RX len: %d\n", cfspi->rx_ppck_len);
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len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Current TX len: %d\n", cfspi->tx_cpck_len);
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len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Current RX len: %d\n", cfspi->rx_cpck_len);
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len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Next TX len: %d\n", cfspi->tx_npck_len);
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len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Next RX len: %d\n", cfspi->rx_npck_len);
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len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"STATE: %d\n", cfspi->dbg_state);
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len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Previous CMD: 0x%x\n", cfspi->pcmd);
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len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Current CMD: 0x%x\n", cfspi->cmd);
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len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Previous TX len: %d\n", cfspi->tx_ppck_len);
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len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Previous RX len: %d\n", cfspi->rx_ppck_len);
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len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Current TX len: %d\n", cfspi->tx_cpck_len);
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len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Current RX len: %d\n", cfspi->rx_cpck_len);
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len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Next TX len: %d\n", cfspi->tx_npck_len);
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len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Next RX len: %d\n", cfspi->rx_npck_len);
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if (len > DEBUGFS_BUF_SIZE)
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len = DEBUGFS_BUF_SIZE;
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@ -180,23 +180,23 @@ static ssize_t print_frame(char *buf, size_t size, char *frm,
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int len = 0;
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int i;
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for (i = 0; i < count; i++) {
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len += snprintf((buf + len), (size - len),
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len += scnprintf((buf + len), (size - len),
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"[0x" BYTE_HEX_FMT "]",
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frm[i]);
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if ((i == cut) && (count > (cut * 2))) {
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/* Fast forward. */
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i = count - cut;
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len += snprintf((buf + len), (size - len),
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"--- %zu bytes skipped ---\n",
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count - (cut * 2));
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len += scnprintf((buf + len), (size - len),
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"--- %zu bytes skipped ---\n",
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count - (cut * 2));
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}
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if ((!(i % 10)) && i) {
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len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"\n");
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len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"\n");
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}
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}
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len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), "\n");
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len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len), "\n");
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return len;
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}
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@ -214,18 +214,18 @@ static ssize_t dbgfs_frame(struct file *file, char __user *user_buf,
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return 0;
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/* Print out debug information. */
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len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Current frame:\n");
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len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Current frame:\n");
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len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Tx data (Len: %d):\n", cfspi->tx_cpck_len);
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len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Tx data (Len: %d):\n", cfspi->tx_cpck_len);
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len += print_frame((buf + len), (DEBUGFS_BUF_SIZE - len),
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cfspi->xfer.va_tx[0],
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(cfspi->tx_cpck_len + SPI_CMD_SZ), 100);
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len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Rx data (Len: %d):\n", cfspi->rx_cpck_len);
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len += scnprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
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"Rx data (Len: %d):\n", cfspi->rx_cpck_len);
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len += print_frame((buf + len), (DEBUGFS_BUF_SIZE - len),
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cfspi->xfer.va_rx,
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