diff mbox series

[net,v3,2/4] llc: Improve setsockopt() handling of malformed user input

Message ID 20241119-sockptr-copy-fixes-v3-2-d752cac4be8e@rbox.co (mailing list archive)
State New
Headers show
Series net: Fix some callers of copy_from_sockptr() | expand

Checks

Context Check Description
tedd_an/pre-ci_am success Success
tedd_an/SubjectPrefix fail "Bluetooth: " prefix is not specified in the subject

Commit Message

Michal Luczaj Nov. 19, 2024, 1:31 p.m. UTC 
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>
---
 net/llc/af_llc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index 4eb52add7103b0f83d6fe7318abf1d1af533d254..0259cde394ba09795a6bf0d44c4ea6767e200aea 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;