The kfifo_to_user() macro is supposed to return zero for success or
negative error codes. Unfortunately, there is a signedness bug so
it returns unsigned int. This only affects callers which try to
save the result in ssize_t and as far as I can see the only place which
does that is line6_hwdep_read().
TL;DR: s/_uint/_int/.
Fixes: 144ecf310eb5 ("kfifo: fix kfifo_alloc() to return a signed int value")
Signed-off-by: Dan Carpenter <[email protected]>
---
include/linux/kfifo.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h
index 86249476b57f..0b35a41440ff 100644
--- a/include/linux/kfifo.h
+++ b/include/linux/kfifo.h
@@ -688,7 +688,7 @@ __kfifo_uint_must_check_helper( \
* writer, you don't need extra locking to use these macro.
*/
#define kfifo_to_user(fifo, to, len, copied) \
-__kfifo_uint_must_check_helper( \
+__kfifo_int_must_check_helper( \
({ \
typeof((fifo) + 1) __tmp = (fifo); \
void __user *__to = (to); \
--
2.35.1