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winebus.sys: Initialize last_report length and buffer. 

Fixes a regression from e9c3c494fd where
although we use the last report length, it was only initialized after
the first corresponding report was received. Calling HidD_GetInputReport
before that could cause a buffer overlow and report invalid data.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=52068
Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Rémi Bernon 2021-11-22 11:05:43 +01:00 committed by Alexandre Julliard
parent 598efc65c0
commit 6d3b3aab25
1 changed files with 7 additions and 3 deletions
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10
dlls/winebus.sys/main.c
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@ -444,8 +444,6 @@ static void process_hid_report(DEVICE_OBJECT *device, BYTE *report_buf, DWORD re
if (!ext->collection_desc.ReportIDs[0].ReportID) last_report = ext->last_reports[0];
else last_report = ext->last_reports[report_buf[0]];
last_report->length = report_len;
memcpy(last_report->buffer, report_buf, report_len);
if ((irp = pop_pending_read(ext)))
@ -861,7 +859,13 @@ static NTSTATUS pdo_pnp_dispatch(DEVICE_OBJECT *device, IRP *irp)
{
if (!(size = reports[i].InputLength)) continue;
size = offsetof( struct hid_report, buffer[size] );
if (!(ext->last_reports[reports[i].ReportID] = RtlAllocateHeap(GetProcessHeap(), 0, size))) status = STATUS_NO_MEMORY;
if (!(report = RtlAllocateHeap(GetProcessHeap(), HEAP_ZERO_MEMORY, size))) status = STATUS_NO_MEMORY;
else
{
report->length = reports[i].InputLength;
report->buffer[0] = reports[i].ReportID;
ext->last_reports[reports[i].ReportID] = report;
}
}
if (!status) ext->state = DEVICE_STATE_STARTED;
}