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NTB: ntb_transport: Use scnprintf() for avoiding potential buffer ove…
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…rflow

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().

Fixes: fce8a7b (PCI-Express Non-Transparent Bridge Support)
Fixes: 282a2fe (NTB: Use DMA Engine to Transmit and Receive)
Fixes: a754a8f (NTB: allocate number transport entries depending on size of ring size)
Fixes: d98ef99 (NTB: Clean up QP stats info)
Fixes: e74bfee (NTB: Add flow control to the ntb_netdev)
Fixes: 569410c (NTB: Use unique DMA channels for TX and RX)
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
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Takashi Iwai authored and Jon Mason committed Mar 13, 2020
1 parent 788b041 commit 7f78c68
Showing 1 changed file with 29 additions and 29 deletions.
58 changes: 29 additions & 29 deletions drivers/ntb/ntb_transport.c
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Original file line number Diff line number Diff line change
Expand Up @@ -481,70 +481,70 @@ static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count,
return -ENOMEM;

out_offset = 0;
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"\nNTB QP stats:\n\n");
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"rx_bytes - \t%llu\n", qp->rx_bytes);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"rx_pkts - \t%llu\n", qp->rx_pkts);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"rx_memcpy - \t%llu\n", qp->rx_memcpy);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"rx_async - \t%llu\n", qp->rx_async);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"rx_ring_empty - %llu\n", qp->rx_ring_empty);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"rx_err_no_buf - %llu\n", qp->rx_err_no_buf);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"rx_err_oflow - \t%llu\n", qp->rx_err_oflow);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"rx_err_ver - \t%llu\n", qp->rx_err_ver);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"rx_buff - \t0x%p\n", qp->rx_buff);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"rx_index - \t%u\n", qp->rx_index);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"rx_max_entry - \t%u\n", qp->rx_max_entry);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"rx_alloc_entry - \t%u\n\n", qp->rx_alloc_entry);

out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"tx_bytes - \t%llu\n", qp->tx_bytes);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"tx_pkts - \t%llu\n", qp->tx_pkts);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"tx_memcpy - \t%llu\n", qp->tx_memcpy);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"tx_async - \t%llu\n", qp->tx_async);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"tx_ring_full - \t%llu\n", qp->tx_ring_full);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"tx_err_no_buf - %llu\n", qp->tx_err_no_buf);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"tx_mw - \t0x%p\n", qp->tx_mw);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"tx_index (H) - \t%u\n", qp->tx_index);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"RRI (T) - \t%u\n",
qp->remote_rx_info->entry);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"tx_max_entry - \t%u\n", qp->tx_max_entry);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"free tx - \t%u\n",
ntb_transport_tx_free_entry(qp));

out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"\n");
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"Using TX DMA - \t%s\n",
qp->tx_dma_chan ? "Yes" : "No");
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"Using RX DMA - \t%s\n",
qp->rx_dma_chan ? "Yes" : "No");
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"QP Link - \t%s\n",
qp->link_is_up ? "Up" : "Down");
out_offset += snprintf(buf + out_offset, out_count - out_offset,
out_offset += scnprintf(buf + out_offset, out_count - out_offset,
"\n");

if (out_offset > out_count)
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