[PATCH net 0/4] net: Fix some callers of copy_from_sockptr()

[Michal Luczaj]

Some callers misinterpret copy_from_sockptr()'s return value. The function
follows copy_from_user(), i.e. returns 0 for success, or the number of
bytes not copied on error. Simply returning the result in a non-zero case
isn't usually what was intended.

Compile tested with CONFIG_LLC, CONFIG_AF_RXRPC, CONFIG_BT enabled.

Last patch probably belongs more to net-next, if any. Here as a RFC.

Suggested-by: Jakub Kicinski <kuba at kernel.org>
Signed-off-by: Michal Luczaj <mhal at rbox.co>
---
Michal Luczaj (4):
      bluetooth: Improve setsockopt() handling of malformed user input
      llc: Improve setsockopt() handling of malformed user input
      rxrpc: Improve setsockopt() handling of malformed user input
      net: Comment copy_from_sockptr() explaining its behaviour

 include/linux/sockptr.h           |  2 ++
 include/net/bluetooth/bluetooth.h |  9 ---------
 net/bluetooth/hci_sock.c          | 14 +++++++-------
 net/bluetooth/iso.c               | 10 +++++-----
 net/bluetooth/l2cap_sock.c        | 20 +++++++++++---------
 net/bluetooth/rfcomm/sock.c       |  9 ++++-----
 net/bluetooth/sco.c               | 11 ++++++-----
 net/llc/af_llc.c                  | 15 ++++++++-------
 net/rxrpc/af_rxrpc.c              |  8 ++++----
 9 files changed, 47 insertions(+), 51 deletions(-)
---
base-commit: cfaaa7d010d1fc58f9717fcc8591201e741d2d49
change-id: 20241114-sockptr-copy-fixes-3999eaa81aa1

Best regards,
-- 
Michal Luczaj <mhal at rbox.co>