REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2032
'ping' command's receive flow utilizes a single Rx token which it
attempts to reuse before recycling the previously received packet.
This causes a situation where under ICMP traffic,
Ping6OnEchoReplyReceived() function will receive an already
recycled packet with EFI_SUCCESS token status and finally
dereference invalid pointers from RxData structure.
Cc: Ray Ni <ray.ni@intel.com>
Cc: Zhichao Gao <zhichao.gao@intel.com>
Signed-off-by: Maciej Rabeda <maciej.rabeda@linux.intel.com>
Reviewed-by: Siyuan Fu <siyuan.fu@intel.com>
Acked-by: Zhichao Gao <zhichao.gao@intel.com>
---
ShellPkg/Library/UefiShellNetwork1CommandsLib/Ping.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/ShellPkg/Library/UefiShellNetwork1CommandsLib/Ping.c b/ShellPkg/Library/UefiShellNetwork1CommandsLib/Ping.c
index 23567fa2c1bb..a3fa32515192 100644
--- a/ShellPkg/Library/UefiShellNetwork1CommandsLib/Ping.c
+++ b/ShellPkg/Library/UefiShellNetwork1CommandsLib/Ping.c
@@ -614,6 +614,11 @@ Ping6OnEchoReplyReceived (
ON_EXIT:
+ //
+ // Recycle the packet before reusing RxToken
+ //
+ gBS->SignalEvent (Private->IpChoice == PING_IP_CHOICE_IP6?((EFI_IP6_RECEIVE_DATA*)Private->RxToken.Packet.RxData)->RecycleSignal:((EFI_IP4_RECEIVE_DATA*)Private->RxToken.Packet.RxData)->RecycleSignal);
+
if (Private->RxCount < Private->SendNum) {
//
// Continue to receive icmp echo reply packets.
@@ -632,10 +637,6 @@ ON_EXIT:
//
Private->Status = EFI_SUCCESS;
}
- //
- // Singal to recycle the each rxdata here, not at the end of process.
- //
- gBS->SignalEvent (Private->IpChoice == PING_IP_CHOICE_IP6?((EFI_IP6_RECEIVE_DATA*)Private->RxToken.Packet.RxData)->RecycleSignal:((EFI_IP4_RECEIVE_DATA*)Private->RxToken.Packet.RxData)->RecycleSignal);
}
/**
--
2.24.0.windows.2
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