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authorLars-Peter Clausen <lars@metafoo.de>2013-11-15 02:32:16 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2013-11-15 04:32:23 +0400
commita019e48cfbfb358786326db3dbc1c565b8f14a56 (patch)
treeecb17f9f9dde58a8da4b340129efabdece82dcc0
parent07968fe4acec6d49e39520ef407ea7f6874b7c2e (diff)
downloadlinux-a019e48cfbfb358786326db3dbc1c565b8f14a56.tar.xz
kfifo: kfifo_copy_{to,from}_user: fix copied bytes calculation
'copied' and 'len' are in bytes, while 'ret' is in elements, so we need to multiply 'ret' with the size of one element to get the correct result. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Cc: Stefani Seibold <stefani@seibold.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--lib/kfifo.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/kfifo.c b/lib/kfifo.c
index 7b7f83027b7b..d79b9d222065 100644
--- a/lib/kfifo.c
+++ b/lib/kfifo.c
@@ -215,7 +215,7 @@ static unsigned long kfifo_copy_from_user(struct __kfifo *fifo,
* incrementing the fifo->in index counter
*/
smp_wmb();
- *copied = len - ret;
+ *copied = len - ret * esize;
/* return the number of elements which are not copied */
return ret;
}
@@ -275,7 +275,7 @@ static unsigned long kfifo_copy_to_user(struct __kfifo *fifo, void __user *to,
* incrementing the fifo->out index counter
*/
smp_wmb();
- *copied = len - ret;
+ *copied = len - ret * esize;
/* return the number of elements which are not copied */
return ret;
}