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[Qemu-stable] [PATCH] acpi: fix buffer overrun on migration

From: Michael S. Tsirkin
Subject: [Qemu-stable] [PATCH] acpi: fix buffer overrun on migration
Date: Thu, 19 Nov 2015 15:35:00 +0200

ich calls acpi_gpe_init with length ICH9_PMIO_GPE0_LEN so
ICH9_PMIO_GPE0_LEN/2 bytes are allocated, but then the full
ICH9_PMIO_GPE0_LEN bytes are migrated.

As a quick work-around, allocate twice the memory.
We'll probably want to tweak code to avoid
migrating the extra ICH9_PMIO_GPE0_LEN/2 bytes,
but that is a bit trickier to do without breaking
migration compatibility.

Tested-by: "Dr. David Alan Gilbert" <address@hidden>
Reported-by: "Dr. David Alan Gilbert" <address@hidden>
Cc: address@hidden
Signed-off-by: Michael S. Tsirkin <address@hidden>
 hw/acpi/core.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/hw/acpi/core.c b/hw/acpi/core.c
index fe6215a..21e113d 100644
--- a/hw/acpi/core.c
+++ b/hw/acpi/core.c
@@ -625,8 +625,12 @@ void acpi_pm1_cnt_reset(ACPIREGS *ar)
 void acpi_gpe_init(ACPIREGS *ar, uint8_t len)
     ar->gpe.len = len;
-    ar->gpe.sts = g_malloc0(len / 2);
-    ar->gpe.en = g_malloc0(len / 2);
+    /* Only first len / 2 bytes are ever used,
+     * but the caller in ich9.c migrates full len bytes.
+     * TODO: fix ich9.c and drop the extra allocation.
+     */
+    ar->gpe.sts = g_malloc0(len);
+    ar->gpe.en = g_malloc0(len);
 void acpi_gpe_reset(ACPIREGS *ar)

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