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nvme-fabrics: 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().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Takashi Iwai 2020-03-11 09:50:37 +01:00 committed by Keith Busch
parent 764e933209
commit 8d8a50e20d
1 changed files with 4 additions and 4 deletions
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8
drivers/nvme/host/fabrics.c
View File

@ -105,14 +105,14 @@ int nvmf_get_address(struct nvme_ctrl *ctrl, char *buf, int size)
int len = 0;
if (ctrl->opts->mask & NVMF_OPT_TRADDR)
len += snprintf(buf, size, "traddr=%s", ctrl->opts->traddr);
len += scnprintf(buf, size, "traddr=%s", ctrl->opts->traddr);
if (ctrl->opts->mask & NVMF_OPT_TRSVCID)
len += snprintf(buf + len, size - len, "%strsvcid=%s",
len += scnprintf(buf + len, size - len, "%strsvcid=%s",
(len) ? "," : "", ctrl->opts->trsvcid);
if (ctrl->opts->mask & NVMF_OPT_HOST_TRADDR)
len += snprintf(buf + len, size - len, "%shost_traddr=%s",
len += scnprintf(buf + len, size - len, "%shost_traddr=%s",
(len) ? "," : "", ctrl->opts->host_traddr);
len += snprintf(buf + len, size - len, "\n");
len += scnprintf(buf + len, size - len, "\n");
return len;
}