From: Viktor Prutyanov <viktor.prutyanov@redhat.com>
Date: Wed, 19 Oct 2022 23:59:48 +0000 (+0300)
Subject: dump/win_dump: limit number of processed PRCBs
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e38c24cb580735883769558801d9e2f2ba9f04c1;p=qemu.git

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>
---

diff --git a/dump/win_dump.c b/dump/win_dump.c
index fd91350fbb..f20b6051b6 100644
--- a/dump/win_dump.c
+++ b/dump/win_dump.c
@@ -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)) {