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Message-Id: <20200311074513.8464-1-tiwai@suse.de> Date: Wed, 11 Mar 2020 08:45:13 +0100 From: Takashi Iwai <tiwai@...e.de> To: Jassi Brar <jassisinghbrar@...il.com> Cc: linux-kernel@...r.kernel.org Subject: [PATCH] mailbox: bcm-pdc: 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(). Signed-off-by: Takashi Iwai <tiwai@...e.de> --- drivers/mailbox/bcm-pdc-mailbox.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/drivers/mailbox/bcm-pdc-mailbox.c b/drivers/mailbox/bcm-pdc-mailbox.c index fcb3b18a0678..c10a9318a4b7 100644 --- a/drivers/mailbox/bcm-pdc-mailbox.c +++ b/drivers/mailbox/bcm-pdc-mailbox.c @@ -436,33 +436,33 @@ static ssize_t pdc_debugfs_read(struct file *filp, char __user *ubuf, pdcs = filp->private_data; out_offset = 0; - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "SPU %u stats:\n", pdcs->pdc_idx); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "PDC requests....................%u\n", pdcs->pdc_requests); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "PDC responses...................%u\n", pdcs->pdc_replies); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Tx not done.....................%u\n", pdcs->last_tx_not_done); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Tx ring full....................%u\n", pdcs->tx_ring_full); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Rx ring full....................%u\n", pdcs->rx_ring_full); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Tx desc write fail. Ring full...%u\n", pdcs->txnobuf); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Rx desc write fail. Ring full...%u\n", pdcs->rxnobuf); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Receive overflow................%u\n", pdcs->rx_oflow); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Num frags in rx ring............%u\n", NRXDACTIVE(pdcs->rxin, pdcs->last_rx_curr, pdcs->nrxpost)); -- 2.16.4
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