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From: Hannes Reinecke <hare@suse.de>
To: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>,
	Keith Busch <keith.busch@wdc.com>,
	linux-nvme@lists.infradead.org, Hannes Reinecke <hare@suse.de>
Subject: [PATCHv2] nvmet: fixup buffer overrung in nvmet_subsys_attr_serial()
Date: Mon,  6 Sep 2021 09:04:03 +0200	[thread overview]
Message-ID: <20210906070403.28159-1-hare@suse.de> (raw)

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>
---
 drivers/nvme/target/configfs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 008be02fbac9..49f85e829c4a 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -1113,7 +1113,8 @@ 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
-- 
2.29.2


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             reply	other threads:[~2021-09-06  7:04 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-06  7:04 Hannes Reinecke [this message]
2021-09-06  8:01 ` [PATCHv2] nvmet: fixup buffer overrung in nvmet_subsys_attr_serial() Christoph Hellwig

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