[PATCH] Add missing overflow check in get_blkdev_list

Patch to clean up missing overflow check in get_blkdev_list.  The printf
which adds the "Block Devices" string in /proc/devices can overflow the
presented page if get_chrdev_list eats up the entire 4k space.

Signed-off-by: Neil Horman <nhorman@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/block/genhd.c b/drivers/block/genhd.c
index 47fd3659a061..d42840cc0d1d 100644
--- a/drivers/block/genhd.c
+++ b/drivers/block/genhd.c
@@ -45,7 +45,7 @@ int get_blkdev_list(char *p, int used)
         struct blk_major_name *n;
         int i, len;
 
-        len = sprintf(p, "\nBlock devices:\n");
+        len = snprintf(p, (PAGE_SIZE-used), "\nBlock devices:\n");
 
         down(&block_subsys_sem);
         for (i = 0; i < ARRAY_SIZE(major_names); i++) {