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...@intel.com> Cc: Zhichao Gao <zhichao....@intel.com> Signed-off-by: Maciej Rabeda <maciej.rab...@linux.intel.com> Reviewed-by: Siyuan Fu <siyuan...@intel.com> Acked-by: Zhichao Gao <zhichao....@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 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#56834): https://edk2.groups.io/g/devel/message/56834 Mute This Topic: https://groups.io/mt/72696861/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-