netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'. ===================================================== BUG: KMSAN: uninit-value in ppp_async_encode drivers/net/ppp/ppp_async.c:550 [inline] BUG: KMSAN: uninit-value in ppp_async_push+0xd8f/0x22c0 drivers/net/ppp/ppp_async.c:680 ppp_async_encode drivers/net/ppp/ppp_async.c:550 [inline] ppp_async_push+0xd8f/0x22c0 drivers/net/ppp/ppp_async.c:680 ppp_async_send+0x144/0x1e0 drivers/net/ppp/ppp_async.c:639 __ppp_channel_push+0x19e/0x390 drivers/net/ppp/ppp_generic.c:2142 ppp_channel_push+0x263/0x320 drivers/net/ppp/ppp_generic.c:2169 ppp_write+0x572/0x5e0 drivers/net/ppp/ppp_generic.c:517 vfs_write+0x8ce/0x2030 fs/read_write.c:588 ksys_write+0x28b/0x510 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0xdb/0x120 fs/read_write.c:652 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae Uninit was created at: slab_post_alloc_hook mm/slab.h:524 [inline] slab_alloc_node mm/slub.c:3251 [inline] __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4974 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0x545/0xf90 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1126 [inline] ppp_write+0x11d/0x5e0 drivers/net/ppp/ppp_generic.c:501 vfs_write+0x8ce/0x2030 fs/read_write.c:588 ksys_write+0x28b/0x510 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0xdb/0x120 fs/read_write.c:652 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae CPU: 1 PID: 10161 Comm: syz-executor.5 Not tainted 5.16.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 =====================================================