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Subject[PATCH 6/9] Bluetooth: Silence DEBUG_STRICT_USER_COPY_CHECKS=y warning
Enabling DEBUG_STRICT_USER_COPY_CHECKS causes the following

In function 'copy_from_user',
inlined from 'rfcomm_sock_setsockopt' at
warning: call to 'copy_from_user_overflow' declared with
attribute warning: copy_from_user() buffer size is not provably

presumably due to buf_size being signed causing GCC to fail to
see that buf_size can't become negative.

Cc: Marcel Holtmann <>
Cc: Gustavo F. Padovan <>
Signed-off-by: Stephen Boyd <>
net/bluetooth/rfcomm/sock.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index 66cc1f0..0698b37 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -679,7 +679,8 @@ static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, c
struct sock *sk = sock->sk;
struct bt_security sec;
- int len, err = 0;
+ int err = 0;
+ size_t len;
u32 opt;

BT_DBG("sk %p", sk);
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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