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pcmcia: Use scnprintf() for avoiding potential buffer overflow

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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@suse.de>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Takashi Iwai 2020-03-11 10:04:26 +01:00 committed by Dominik Brodowski
parent 7c8c5673f6
commit 6d3fbe919b
2 changed files with 8 additions and 8 deletions
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6
drivers/pcmcia/rsrc_nonstatic.c
View File

@ -1076,7 +1076,7 @@ static ssize_t show_io_db(struct device *dev,
for (p = data->io_db.next; p != &data->io_db; p = p->next) { for (p = data->io_db.next; p != &data->io_db; p = p->next) {
if (ret > (PAGE_SIZE - 10)) if (ret > (PAGE_SIZE - 10))
continue; continue;
ret += snprintf(&buf[ret], (PAGE_SIZE - ret - 1), ret += scnprintf(&buf[ret], (PAGE_SIZE - ret - 1),
"0x%08lx - 0x%08lx\n", "0x%08lx - 0x%08lx\n",
((unsigned long) p->base), ((unsigned long) p->base),
((unsigned long) p->base + p->num - 1)); ((unsigned long) p->base + p->num - 1));
@ -1133,7 +1133,7 @@ static ssize_t show_mem_db(struct device *dev,
p = p->next) { p = p->next) {
if (ret > (PAGE_SIZE - 10)) if (ret > (PAGE_SIZE - 10))
continue; continue;
ret += snprintf(&buf[ret], (PAGE_SIZE - ret - 1), ret += scnprintf(&buf[ret], (PAGE_SIZE - ret - 1),
"0x%08lx - 0x%08lx\n", "0x%08lx - 0x%08lx\n",
((unsigned long) p->base), ((unsigned long) p->base),
((unsigned long) p->base + p->num - 1)); ((unsigned long) p->base + p->num - 1));
@ -1142,7 +1142,7 @@ static ssize_t show_mem_db(struct device *dev,
for (p = data->mem_db.next; p != &data->mem_db; p = p->next) { for (p = data->mem_db.next; p != &data->mem_db; p = p->next) {
if (ret > (PAGE_SIZE - 10)) if (ret > (PAGE_SIZE - 10))
continue; continue;
ret += snprintf(&buf[ret], (PAGE_SIZE - ret - 1), ret += scnprintf(&buf[ret], (PAGE_SIZE - ret - 1),
"0x%08lx - 0x%08lx\n", "0x%08lx - 0x%08lx\n",
((unsigned long) p->base), ((unsigned long) p->base),
((unsigned long) p->base + p->num - 1)); ((unsigned long) p->base + p->num - 1));

10
drivers/pcmcia/yenta_socket.c
View File

@ -180,12 +180,12 @@ static ssize_t show_yenta_registers(struct device *yentadev, struct device_attri
for (i = 0; i < 0x24; i += 4) { for (i = 0; i < 0x24; i += 4) {
unsigned val; unsigned val;
if (!(i & 15)) if (!(i & 15))
offset += snprintf(buf + offset, PAGE_SIZE - offset, "\n%02x:", i); offset += scnprintf(buf + offset, PAGE_SIZE - offset, "\n%02x:", i);
val = cb_readl(socket, i); val = cb_readl(socket, i);
offset += snprintf(buf + offset, PAGE_SIZE - offset, " %08x", val); offset += scnprintf(buf + offset, PAGE_SIZE - offset, " %08x", val);
} }
offset += snprintf(buf + offset, PAGE_SIZE - offset, "\n\nExCA registers:"); offset += scnprintf(buf + offset, PAGE_SIZE - offset, "\n\nExCA registers:");
for (i = 0; i < 0x45; i++) { for (i = 0; i < 0x45; i++) {
unsigned char val; unsigned char val;
if (!(i & 7)) { if (!(i & 7)) {
@ -193,10 +193,10 @@ static ssize_t show_yenta_registers(struct device *yentadev, struct device_attri
memcpy(buf + offset, " -", 2); memcpy(buf + offset, " -", 2);
offset += 2; offset += 2;
} else } else
offset += snprintf(buf + offset, PAGE_SIZE - offset, "\n%02x:", i); offset += scnprintf(buf + offset, PAGE_SIZE - offset, "\n%02x:", i);
} }
val = exca_readb(socket, i); val = exca_readb(socket, i);
offset += snprintf(buf + offset, PAGE_SIZE - offset, " %02x", val); offset += scnprintf(buf + offset, PAGE_SIZE - offset, " %02x", val);
} }
buf[offset++] = '\n'; buf[offset++] = '\n';
return offset; return offset;