tcp: fix null ptr deref in getsockopt(..., TCP_ULP, ...)

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If icsk_ulp_ops is unset, it dereferences a null ptr.
Add a null ptr check.

BUG: KASAN: null-ptr-deref in copy_to_user include/linux/uaccess.h:168 [inline]
BUG: KASAN: null-ptr-deref in do_tcp_getsockopt.isra.33+0x24f/0x1e30 net/ipv4/tcp.c:3057
Read of size 4 at addr 0000000000000020 by task syz-executor1/15452

Signed-off-by: Dave Watson <davejwatson@fb.com>
Reported-by: "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

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Dave Watson 2017-06-26 08:36:47 -07:00 • committed by David S. Miller

parent 019b13ae85

commit d97af30f61

1 changed files with 5 additions and 0 deletions

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net/ipv4/tcp.c

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