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From: Chaitanya Kulkarni <chaitanyak@nvidia.com>
To: <linux-block@vger.kernel.org>
Cc: Chaitanya Kulkarni <kch@nvidia.com>,
	Himanshu Madhani <himanshu.madhani@oracle.com>
Subject: [PATCH V2 2/8] loop: use sysfs_emit() in the sysfs sizelimit show
Date: Wed, 22 Sep 2021 18:49:39 -0700	[thread overview]
Message-ID: <20210923014945.6229-3-chaitanyak@nvidia.com> (raw)
In-Reply-To: <20210923014945.6229-1-chaitanyak@nvidia.com>

From: Chaitanya Kulkarni <kch@nvidia.com>

sprintf does not know the PAGE_SIZE maximum of the temporary buffer
used for outputting sysfs content and it's possible to overrun the
PAGE_SIZE buffer length.

Use a generic sysfs_emit function that knows the size of the
temporary buffer and ensures that no overrun is done for offset
attribute.

Signed-off-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
---
 drivers/block/loop.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index e37444977ae6..ec1329afc154 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -861,7 +861,7 @@ static ssize_t loop_attr_offset_show(struct loop_device *lo, char *buf)
 
 static ssize_t loop_attr_sizelimit_show(struct loop_device *lo, char *buf)
 {
-	return sprintf(buf, "%llu\n", (unsigned long long)lo->lo_sizelimit);
+	return sysfs_emit(buf, "%llu\n", (unsigned long long)lo->lo_sizelimit);
 }
 
 static ssize_t loop_attr_autoclear_show(struct loop_device *lo, char *buf)
-- 
2.29.0


  parent reply	other threads:[~2021-09-23  1:50 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-23  1:49 [PATCH V2 0/8] loop: small clenaup Chaitanya Kulkarni
2021-09-23  1:49 ` [PATCH V2 1/8] loop: use sysfs_emit() in the sysfs offset show Chaitanya Kulkarni
2021-09-23  1:49 ` Chaitanya Kulkarni [this message]
2021-09-23  1:49 ` [PATCH V2 3/8] loop: use sysfs_emit() in the sysfs autoclear show Chaitanya Kulkarni
2021-09-23  1:49 ` [PATCH V2 4/8] loop: use sysfs_emit() in the sysfs partscan show Chaitanya Kulkarni
2021-09-23  1:49 ` [PATCH V2 5/8] loop: use sysfs_emit() in the sysfs dio show Chaitanya Kulkarni
2021-09-23  1:49 ` [PATCH V2 6/8] loop: remove extra variable in lo_fallocate() Chaitanya Kulkarni
2021-09-23  1:49 ` [PATCH V2 7/8] loop: remove extra variable in lo_req_flush Chaitanya Kulkarni
2021-09-23  1:49 ` [PATCH V2 8/8] loop: allow user to set the queue depth Chaitanya Kulkarni

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