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kfifo: kfifo_copy_{to,from}_user: fix copied bytes calculation

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'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>
This commit is contained in:
Lars-Peter Clausen 2013-11-14 14:32:16 -08:00 • committed by Linus Torvalds
parent 07968fe4ac
commit a019e48cfb
1 changed files with 2 additions and 2 deletions
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4
lib/kfifo.c
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@ -215,7 +215,7 @@ static unsigned long kfifo_copy_from_user(struct __kfifo *fifo,
* incrementing the fifo->in index counter * incrementing the fifo->in index counter
*/ */
smp_wmb(); smp_wmb();
*copied = len - ret; *copied = len - ret * esize;
/* return the number of elements which are not copied */ /* return the number of elements which are not copied */
return ret; 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 * incrementing the fifo->out index counter
*/ */
smp_wmb(); smp_wmb();
*copied = len - ret; *copied = len - ret * esize;
/* return the number of elements which are not copied */ /* return the number of elements which are not copied */
return ret; return ret;
} }