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| author | Andrey Konovalov <andreyknvl@google.com> | 2017-03-29 16:11:22 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-03-30 11:04:00 -0700 |
| commit | bcc5364bdcfe131e6379363f089e7b4108d35b70 (patch) | |
| tree | 43e301600bc32c0bca913032b45b0f859600b8d1 /net/packet | |
| parent | 8f8d28e4d6d815a391285e121c3a53a0b6cb9e7b (diff) | |
| download | linux-bcc5364bdcfe131e6379363f089e7b4108d35b70.tar.gz linux-bcc5364bdcfe131e6379363f089e7b4108d35b70.tar.bz2 linux-bcc5364bdcfe131e6379363f089e7b4108d35b70.zip | |
net/packet: fix overflow in check for tp_reserve
When calculating po->tp_hdrlen + po->tp_reserve the result can overflow.
Fix by checking that tp_reserve <= INT_MAX on assign.
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet')
| -rw-r--r-- | net/packet/af_packet.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 3ac286ebb2f4..8489beff5c25 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -3665,6 +3665,8 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv return -EBUSY; if (copy_from_user(&val, optval, sizeof(val))) return -EFAULT; + if (val > INT_MAX) + return -EINVAL; po->tp_reserve = val; return 0; } |