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Check number of packets in exchange buffer for overflow

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Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2019-06-05 11:51:26 +02:00 committed by Jason A. Donenfeld
parent fd6300dc6f
commit cc3c1fefcb
1 changed files with 6 additions and 1 deletions
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7
wintun.c
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@ -26,7 +26,7 @@
#define TUN_VENDOR_ID 0xFFFFFF00
#define TUN_LINK_SPEED 100000000000ULL // 100gbps
#define TUN_EXCH_MAX_PACKETS 256 // Maximum number of exchange packets that can be exchanged in a single read/write
#define TUN_EXCH_MAX_PACKETS 256 // Maximum number of full-sized exchange packets that can be exchanged in a single read/write
#define TUN_EXCH_MAX_PACKET_SIZE 0xF000 // Maximum exchange packet size - empirically determined by net buffer list (pool) limitations
#define TUN_EXCH_ALIGNMENT 16 // Memory alignment in exchange buffers
#define TUN_EXCH_MAX_IP_PACKET_SIZE (TUN_EXCH_MAX_PACKET_SIZE - sizeof(TUN_PACKET)) // Maximum IP packet size (headers + payload)
@ -610,6 +610,11 @@ static NTSTATUS TunWriteFromIrp(_Inout_ TUN_CTX *ctx, _Inout_ IRP *Irp)
ULONG nbl_count = 0;
NET_BUFFER_LIST *nbl_head = NULL, *nbl_tail = NULL;
while (b + sizeof(TUN_PACKET) <= b_end) {
if (nbl_count >= MAXULONG) {
status = STATUS_INVALID_USER_BUFFER;
goto cleanup_nbl_head;
}
TUN_PACKET *p = (TUN_PACKET *)b;
if (p->Size > TUN_EXCH_MAX_IP_PACKET_SIZE) {
status = STATUS_INVALID_USER_BUFFER;