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block: aoe: 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: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Takashi Iwai 2020-03-11 08:12:58 +01:00 committed by Jens Axboe
parent 0fbcf57982
commit 0348510490
1 changed files with 2 additions and 2 deletions
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4
drivers/block/aoe/aoeblk.c
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@ -87,9 +87,9 @@ static ssize_t aoedisk_show_netif(struct device *dev,
if (*nd == NULL)
return snprintf(page, PAGE_SIZE, "none\n");
for (p = page; nd < ne; nd++)
p += snprintf(p, PAGE_SIZE - (p-page), "%s%s",
p += scnprintf(p, PAGE_SIZE - (p-page), "%s%s",
p == page ? "" : ",", (*nd)->name);
p += snprintf(p, PAGE_SIZE - (p-page), "\n");
p += scnprintf(p, PAGE_SIZE - (p-page), "\n");
return p-page;
}
/* firmware version */