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usb: cdns2: Replace snprintf() with the safer scnprintf() variant

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There is a general misunderstanding amongst engineers that {v}snprintf()
returns the length of the data *actually* encoded into the destination
array.  However, as per the C99 standard {v}snprintf() really returns
the length of the data that *would have been* written if there were
enough space for it.  This misunderstanding has led to buffer-overruns
in the past.  It's generally considered safer to use the {v}scnprintf()
variants in their place (or even sprintf() in simple cases).  So let's
do that.

Link: https://lwn.net/Articles/69419/
Link: https://github.com/KSPP/linux/issues/105
Cc: Pawel Laszczak <pawell@cadence.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20231213164246.1021885-7-lee@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lee Jones 2023-12-13 16:42:35 +00:00 committed by Greg Kroah-Hartman
parent d32dcb0659
commit 01dc7f7c29
1 changed files with 69 additions and 69 deletions
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138
drivers/usb/gadget/udc/cdns2/cdns2-debug.h
View file

@ -16,34 +16,34 @@ static inline const char *cdns2_decode_usb_irq(char *str, size_t size,
{
int ret;
ret = snprintf(str, size, "usbirq: 0x%02x - ", usb_irq);
ret = scnprintf(str, size, "usbirq: 0x%02x - ", usb_irq);
if (usb_irq & USBIRQ_SOF)
ret += snprintf(str + ret, size - ret, "SOF ");
ret += scnprintf(str + ret, size - ret, "SOF ");
if (usb_irq & USBIRQ_SUTOK)
ret += snprintf(str + ret, size - ret, "SUTOK ");
ret += scnprintf(str + ret, size - ret, "SUTOK ");
if (usb_irq & USBIRQ_SUDAV)
ret += snprintf(str + ret, size - ret, "SETUP ");
ret += scnprintf(str + ret, size - ret, "SETUP ");
if (usb_irq & USBIRQ_SUSPEND)
ret += snprintf(str + ret, size - ret, "Suspend ");
ret += scnprintf(str + ret, size - ret, "Suspend ");
if (usb_irq & USBIRQ_URESET)
ret += snprintf(str + ret, size - ret, "Reset ");
ret += scnprintf(str + ret, size - ret, "Reset ");
if (usb_irq & USBIRQ_HSPEED)
ret += snprintf(str + ret, size - ret, "HS ");
ret += scnprintf(str + ret, size - ret, "HS ");
if (usb_irq & USBIRQ_LPM)
ret += snprintf(str + ret, size - ret, "LPM ");
ret += scnprintf(str + ret, size - ret, "LPM ");
ret += snprintf(str + ret, size - ret, ", EXT: 0x%02x - ", ext_irq);
ret += scnprintf(str + ret, size - ret, ", EXT: 0x%02x - ", ext_irq);
if (ext_irq & EXTIRQ_WAKEUP)
ret += snprintf(str + ret, size - ret, "Wakeup ");
ret += scnprintf(str + ret, size - ret, "Wakeup ");
if (ext_irq & EXTIRQ_VBUSFAULT_FALL)
ret += snprintf(str + ret, size - ret, "VBUS_FALL ");
ret += scnprintf(str + ret, size - ret, "VBUS_FALL ");
if (ext_irq & EXTIRQ_VBUSFAULT_RISE)
ret += snprintf(str + ret, size - ret, "VBUS_RISE ");
ret += scnprintf(str + ret, size - ret, "VBUS_RISE ");
if (ret >= size)
pr_info("CDNS2: buffer overflowed.\n");
if (ret == size - 1)
pr_info("CDNS2: buffer may be truncated.\n");
return str;
}
@ -54,28 +54,28 @@ static inline const char *cdns2_decode_dma_irq(char *str, size_t size,
{
int ret;
ret = snprintf(str, size, "ISTS: %08x, %s: %08x ",
ep_ists, ep_name, ep_sts);
ret = scnprintf(str, size, "ISTS: %08x, %s: %08x ",
ep_ists, ep_name, ep_sts);
if (ep_sts & DMA_EP_STS_IOC)
ret += snprintf(str + ret, size - ret, "IOC ");
ret += scnprintf(str + ret, size - ret, "IOC ");
if (ep_sts & DMA_EP_STS_ISP)
ret += snprintf(str + ret, size - ret, "ISP ");
ret += scnprintf(str + ret, size - ret, "ISP ");
if (ep_sts & DMA_EP_STS_DESCMIS)
ret += snprintf(str + ret, size - ret, "DESCMIS ");
ret += scnprintf(str + ret, size - ret, "DESCMIS ");
if (ep_sts & DMA_EP_STS_TRBERR)
ret += snprintf(str + ret, size - ret, "TRBERR ");
ret += scnprintf(str + ret, size - ret, "TRBERR ");
if (ep_sts & DMA_EP_STS_OUTSMM)
ret += snprintf(str + ret, size - ret, "OUTSMM ");
ret += scnprintf(str + ret, size - ret, "OUTSMM ");
if (ep_sts & DMA_EP_STS_ISOERR)
ret += snprintf(str + ret, size - ret, "ISOERR ");
ret += scnprintf(str + ret, size - ret, "ISOERR ");
if (ep_sts & DMA_EP_STS_DBUSY)
ret += snprintf(str + ret, size - ret, "DBUSY ");
ret += scnprintf(str + ret, size - ret, "DBUSY ");
if (DMA_EP_STS_CCS(ep_sts))
ret += snprintf(str + ret, size - ret, "CCS ");
ret += scnprintf(str + ret, size - ret, "CCS ");
if (ret >= size)
pr_info("CDNS2: buffer overflowed.\n");
if (ret == size - 1)
pr_info("CDNS2: buffer may be truncated.\n");
return str;
}
@ -105,43 +105,43 @@ static inline const char *cdns2_raw_ring(struct cdns2_endpoint *pep,
int ret;
int i;
ret = snprintf(str, size, "\n\t\tTR for %s:", pep->name);
ret = scnprintf(str, size, "\n\t\tTR for %s:", pep->name);
trb = &trbs[ring->dequeue];
dma = cdns2_trb_virt_to_dma(pep, trb);
ret += snprintf(str + ret, size - ret,
"\n\t\tRing deq index: %d, trb: V=%p, P=0x%pad\n",
ring->dequeue, trb, &dma);
ret += scnprintf(str + ret, size - ret,
"\n\t\tRing deq index: %d, trb: V=%p, P=0x%pad\n",
ring->dequeue, trb, &dma);
trb = &trbs[ring->enqueue];
dma = cdns2_trb_virt_to_dma(pep, trb);
ret += snprintf(str + ret, size - ret,
"\t\tRing enq index: %d, trb: V=%p, P=0x%pad\n",
ring->enqueue, trb, &dma);
ret += scnprintf(str + ret, size - ret,
"\t\tRing enq index: %d, trb: V=%p, P=0x%pad\n",
ring->enqueue, trb, &dma);
ret += snprintf(str + ret, size - ret,
"\t\tfree trbs: %d, CCS=%d, PCS=%d\n",
ring->free_trbs, ring->ccs, ring->pcs);
ret += scnprintf(str + ret, size - ret,
"\t\tfree trbs: %d, CCS=%d, PCS=%d\n",
ring->free_trbs, ring->ccs, ring->pcs);
if (TRBS_PER_SEGMENT > 40) {
ret += snprintf(str + ret, size - ret,
"\t\tTransfer ring %d too big\n", TRBS_PER_SEGMENT);
ret += scnprintf(str + ret, size - ret,
"\t\tTransfer ring %d too big\n", TRBS_PER_SEGMENT);
return str;
}
dma = ring->dma;
for (i = 0; i < TRBS_PER_SEGMENT; ++i) {
trb = &trbs[i];
ret += snprintf(str + ret, size - ret,
"\t\t@%pad %08x %08x %08x\n", &dma,
le32_to_cpu(trb->buffer),
le32_to_cpu(trb->length),
le32_to_cpu(trb->control));
ret += scnprintf(str + ret, size - ret,
"\t\t@%pad %08x %08x %08x\n", &dma,
le32_to_cpu(trb->buffer),
le32_to_cpu(trb->length),
le32_to_cpu(trb->control));
dma += sizeof(*trb);
}
if (ret >= size)
pr_info("CDNS2: buffer overflowed.\n");
if (ret == size - 1)
pr_info("CDNS2: buffer may be truncated.\n");
return str;
}
@ -166,36 +166,36 @@ static inline const char *cdns2_decode_trb(char *str, size_t size, u32 flags,
switch (type) {
case TRB_LINK:
ret = snprintf(str, size,
"LINK %08x type '%s' flags %c:%c:%c%c:%c",
buffer, cdns2_trb_type_string(type),
flags & TRB_CYCLE ? 'C' : 'c',
flags & TRB_TOGGLE ? 'T' : 't',
flags & TRB_CHAIN ? 'C' : 'c',
flags & TRB_CHAIN ? 'H' : 'h',
flags & TRB_IOC ? 'I' : 'i');
ret = scnprintf(str, size,
"LINK %08x type '%s' flags %c:%c:%c%c:%c",
buffer, cdns2_trb_type_string(type),
flags & TRB_CYCLE ? 'C' : 'c',
flags & TRB_TOGGLE ? 'T' : 't',
flags & TRB_CHAIN ? 'C' : 'c',
flags & TRB_CHAIN ? 'H' : 'h',
flags & TRB_IOC ? 'I' : 'i');
break;
case TRB_NORMAL:
ret = snprintf(str, size,
"type: '%s', Buffer: %08x, length: %ld, burst len: %ld, "
"flags %c:%c:%c%c:%c",
cdns2_trb_type_string(type),
buffer, TRB_LEN(length),
TRB_FIELD_TO_BURST(length),
flags & TRB_CYCLE ? 'C' : 'c',
flags & TRB_ISP ? 'I' : 'i',
flags & TRB_CHAIN ? 'C' : 'c',
flags & TRB_CHAIN ? 'H' : 'h',
flags & TRB_IOC ? 'I' : 'i');
ret = scnprintf(str, size,
"type: '%s', Buffer: %08x, length: %ld, burst len: %ld, "
"flags %c:%c:%c%c:%c",
cdns2_trb_type_string(type),
buffer, TRB_LEN(length),
TRB_FIELD_TO_BURST(length),
flags & TRB_CYCLE ? 'C' : 'c',
flags & TRB_ISP ? 'I' : 'i',
flags & TRB_CHAIN ? 'C' : 'c',
flags & TRB_CHAIN ? 'H' : 'h',
flags & TRB_IOC ? 'I' : 'i');
break;
default:
ret = snprintf(str, size, "type '%s' -> raw %08x %08x %08x",
cdns2_trb_type_string(type),
buffer, length, flags);
ret = scnprintf(str, size, "type '%s' -> raw %08x %08x %08x",
cdns2_trb_type_string(type),
buffer, length, flags);
}
if (ret >= size)
pr_info("CDNS2: buffer overflowed.\n");
if (ret == size - 1)
pr_info("CDNS2: buffer may be truncated.\n");
return str;
}