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[4/8] loop: use sysfs_emit() in the sysfs partscan show

Message ID 20220214100119.6795-5-kch@nvidia.com (mailing list archive)
State New, archived
Headers show
Series loop: cleanup and few improvements | expand

Commit Message

Chaitanya Kulkarni Feb. 14, 2022, 10:01 a.m. UTC 
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(-)
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Patch

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index c049c1967ec3..7fa6f68d7e41 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -699,7 +699,7 @@  static ssize_t loop_attr_partscan_show(struct loop_device *lo, char *buf)
 {
 	int partscan = (lo->lo_flags & LO_FLAGS_PARTSCAN);
 
-	return sprintf(buf, "%s\n", partscan ? "1" : "0");
+	return sysfs_emit(buf, "%s\n", partscan ? "1" : "0");
 }
 
 static ssize_t loop_attr_dio_show(struct loop_device *lo, char *buf)