dump/win_dump: limit number of processed PRCBs

When number of CPUs utilized by guest Windows is less than defined in
QEMU (i.e., desktop versions of Windows severely limits number of CPU
sockets), patch_and_save_context routine accesses non-existent PRCB and
fails. So, limit number of processed PRCBs by NumberProcessors taken
from guest Windows driver.

Signed-off-by: Viktor Prutyanov <viktor.prutyanov@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20221019235948.656411-1-viktor.prutyanov@redhat.com>
This commit is contained in:
Viktor Prutyanov 2022-10-20 02:59:48 +03:00 committed by Marc-André Lureau
parent 113d8f4e95
commit e38c24cb58

View File

@ -273,6 +273,13 @@ static void patch_and_save_context(WinDumpHeader *h, bool x64,
uint64_t Context;
WinContext ctx;
if (i >= WIN_DUMP_FIELD(NumberProcessors)) {
warn_report("win-dump: number of QEMU CPUs is bigger than"
" NumberProcessors (%u) in guest Windows",
WIN_DUMP_FIELD(NumberProcessors));
return;
}
if (cpu_read_ptr(x64, first_cpu,
KiProcessorBlock + i * win_dump_ptr_size(x64),
&Prcb)) {