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nvmet: fixup buffer overrun in nvmet_subsys_attr_serial()

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The serial number is copied into the buffer via memcpy_and_pad()
with the length NVMET_SN_MAX_SIZE. So when printing out we also
need to take just that length as anything beyond that will be
uninitialized.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Hannes Reinecke 2021-09-06 09:04:03 +02:00 • committed by Christoph Hellwig
parent ab7a2737ac
commit f04064814c
1 changed files with 2 additions and 1 deletions
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3
drivers/nvme/target/configfs.c
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@ -1067,7 +1067,8 @@ static ssize_t nvmet_subsys_attr_serial_show(struct config_item *item,
{
struct nvmet_subsys *subsys = to_subsys(item);
return snprintf(page, PAGE_SIZE, "%s\n", subsys->serial);
return snprintf(page, PAGE_SIZE, "%*s\n",
NVMET_SN_MAX_SIZE, subsys->serial);
}
static ssize_t