net-timestamp: fix allocation error in test

A buffer is incorrectly zeroed to the length of the pointer. If
cfg_payload_len < sizeof(void *) this can overwrites unrelated memory.
The buffer contents are never read, so no need to zero.

Fixes: 8fe2f761cae9 ("net-timestamp: expand documentation")
Reported-by: Daniel Borkmann <[email protected]>
Signed-off-by: Willem de Bruijn <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

diff --git a/Documentation/networking/timestamping/txtimestamp.c b/Documentation/networking/timestamping/txtimestamp.c
index e5b0b98a89afef1b607eba662b46a14def1b85f5..b32fc2a07734ca28ac60a30913dab738b8111f57 100644 (file)
--- a/Documentation/networking/timestamping/txtimestamp.c
+++ b/Documentation/networking/timestamping/txtimestamp.c
@@ -192,7 +192,6 @@ static int recv_errmsg(int fd)
        memset(&msg, 0, sizeof(msg));
        memset(&entry, 0, sizeof(entry));
        memset(ctrl, 0, sizeof(ctrl));
-       memset(data, 0, sizeof(data));
 
        entry.iov_base = data;
        entry.iov_len = cfg_payload_len;