6.11-stable review patch. If anyone has any objections, please let me know.
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From: Michal Luczaj mhal@rbox.co
[ Upstream commit 1465036b10be4b8b00eb31c879e86de633ad74c1 ]
copy_from_sockptr() is used incorrectly: return value is the number of bytes that could not be copied. Since it's deprecated, switch to copy_safe_from_sockptr().
Note: Keeping the `optlen != sizeof(int)` check as copy_safe_from_sockptr() by itself would also accept optlen > sizeof(int). Which would allow a more lenient handling of inputs.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Suggested-by: David Wei dw@davidwei.uk Signed-off-by: Michal Luczaj mhal@rbox.co Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/llc/af_llc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c index 4eb52add7103b..0259cde394ba0 100644 --- a/net/llc/af_llc.c +++ b/net/llc/af_llc.c @@ -1098,7 +1098,7 @@ static int llc_ui_setsockopt(struct socket *sock, int level, int optname, lock_sock(sk); if (unlikely(level != SOL_LLC || optlen != sizeof(int))) goto out; - rc = copy_from_sockptr(&opt, optval, sizeof(opt)); + rc = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen); if (rc) goto out; rc = -EINVAL;