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MdeModulePkg/Dhcp4Dxe: Free NET_BUF data after sent out to avoid memory leak 

* When build a DHCP message in function DhcpSendMessage() or DhcpRetransmit(),
a new NET_BUF is created by the library of NetbufFromExt, but it's not freed
after it is sent out. This patch is to fix this memory leak issue.

V2:
* Since packet has already been referred by DhcpSb->LastPacket, and will be
freed when sending another packet or clean up, there is no need to add an
extra free function in NetbufFromExt.

Cc: Jiaxin Wu <jiaxin.wu@intel.com>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Wang Fan <fan.wang@intel.com>
Reviewed-by: Jiaxin Wu <jiaxin.wu@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
This commit is contained in:
Wang Fan 2018-01-10 15:24:53 +08:00 committed by Jiaxin Wu
parent 427b2f41a6
commit 479a3b6053
2 changed files with 19 additions and 27 deletions
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14
MdeModulePkg/Universal/Network/Dhcp4Dxe/Dhcp4Impl.h
View File

@ -6,7 +6,7 @@
RFC 1534: Interoperation Between DHCP and BOOTP
RFC 3396: Encoding Long Options in DHCP.
Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@ -184,6 +184,18 @@ DhcpCleanConfigure (
IN OUT EFI_DHCP4_CONFIG_DATA *Config
);
/**
Callback of Dhcp packet. Does nothing.
@param Arg The context.
**/
VOID
EFIAPI
DhcpDummyExtFree (
IN VOID *Arg
);
/**
Set the elapsed time based on the given instance and the pointer to the
elapsed time option.

32
MdeModulePkg/Universal/Network/Dhcp4Dxe/Dhcp4Io.c
View File

@ -1,7 +1,7 @@
/** @file
EFI DHCP protocol implementation.
Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@ -1096,23 +1096,6 @@ RESTART:
}
}
/**
Release the packet.
@param[in] Arg The packet to release
**/
VOID
EFIAPI
DhcpReleasePacket (
IN VOID *Arg
)
{
FreePool (Arg);
}
/**
Release the net buffer when packet is sent.
@ -1359,13 +1342,12 @@ DhcpSendMessage (
Packet->Dhcp4.Header.HwAddrLen
);
//
// Wrap it into a netbuf then send it.
//
Frag.Bulk = (UINT8 *) &Packet->Dhcp4.Header;
Frag.Len = Packet->Length;
Wrap = NetbufFromExt (&Frag, 1, 0, 0, DhcpReleasePacket, Packet);
Wrap = NetbufFromExt (&Frag, 1, 0, 0, DhcpDummyExtFree, NULL);
if (Wrap == NULL) {
FreePool (Packet);
@ -1399,7 +1381,6 @@ DhcpSendMessage (
}
ASSERT (UdpIo != NULL);
NET_GET_REF (Wrap);
Status = UdpIoSendDatagram (
UdpIo,
@ -1411,7 +1392,7 @@ DhcpSendMessage (
);
if (EFI_ERROR (Status)) {
NET_PUT_REF (Wrap);
NetbufFree (Wrap);
return EFI_ACCESS_DENIED;
}
@ -1454,12 +1435,12 @@ DhcpRetransmit (
//
Frag.Bulk = (UINT8 *) &DhcpSb->LastPacket->Dhcp4.Header;
Frag.Len = DhcpSb->LastPacket->Length;
Wrap = NetbufFromExt (&Frag, 1, 0, 0, DhcpReleasePacket, DhcpSb->LastPacket);
Wrap = NetbufFromExt (&Frag, 1, 0, 0, DhcpDummyExtFree, NULL);
if (Wrap == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// Broadcast the message, unless we know the server address.
//
@ -1477,7 +1458,6 @@ DhcpRetransmit (
ASSERT (UdpIo != NULL);
NET_GET_REF (Wrap);
Status = UdpIoSendDatagram (
UdpIo,
Wrap,
@ -1488,7 +1468,7 @@ DhcpRetransmit (
);
if (EFI_ERROR (Status)) {
NET_PUT_REF (Wrap);
NetbufFree (Wrap);
return EFI_ACCESS_DENIED;
}