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seabios: add check to avoid dereference NULL pointer

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eillon 2022-02-14 15:47:43 +08:00 committed by yezengruan
parent f79cd68904
commit 86062beb87
2 changed files with 41 additions and 1 deletions
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6
qemu.spec
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@ -1,6 +1,6 @@
Name: qemu
Version: 6.2.0
Release: 14
Release: 15
Epoch: 2
Summary: QEMU is a generic and open source machine emulator and virtualizer
License: GPLv2 and BSD and MIT and CC-BY-SA-4.0
@ -168,6 +168,7 @@ Patch0155: qmp-add-command-to-query-used-memslots-of-vhost-net-.patch
Patch0156: vhost-user-scsi-add-support-for-SPDK-hot-upgrade.patch
Patch0157: i6300esb-watchdog-bugfix-Add-a-runstate-transition.patch
Patch0158: bugfix-irq-Avoid-covering-object-refcount-of-qemu_ir.patch
Patch0159: seabios-add-check-to-avoid-dereference-NULL-pointer.patch
BuildRequires: flex
BuildRequires: gcc
@ -612,6 +613,9 @@ getent passwd qemu >/dev/null || \
%endif
%changelog
* Mon Feb 14 2022 eillon <yezhenyu2@huawei.com>
- seabios: add check to avoid dereference NULL pointer
* Sat Feb 12 2022 Chen Qun <kuhn.chenqun@huawei.com>
- bugfix: irq: Avoid covering object refcount of qemu_irq

36
seabios-add-check-to-avoid-dereference-NULL-pointer.patch Normal file
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@ -0,0 +1,36 @@
From e6b133311a7a5a618b48c6f38e3c3bb9e9a395c9 Mon Sep 17 00:00:00 2001
From: eillon <yezhenyu2@huawei.com>
Date: Mon, 14 Feb 2022 15:35:28 +0800
Subject: [PATCH] seabios: add check to avoid dereference NULL pointer
alloc_find_lowest() may return NULL, check it.
Signed-off-by: eillon <yezhenyu2@huawei.com>
---
roms/seabios/src/malloc.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/roms/seabios/src/malloc.c b/roms/seabios/src/malloc.c
index 5827a6523..99fa3b7e0 100644
--- a/roms/seabios/src/malloc.c
+++ b/roms/seabios/src/malloc.c
@@ -544,10 +544,12 @@ malloc_prepboot(void)
// Clear unused f-seg ram.
struct allocinfo_s *info = alloc_find_lowest(&ZoneFSeg);
- u32 size = info->range_end - info->range_start;
- memset(memremap(info->range_start, size), 0, size);
- dprintf(1, "Space available for UMB: %x-%x, %x-%x\n"
- , RomEnd, base, info->range_start, info->range_end);
+ if (info) {
+ u32 size = info->range_end - info->range_start;
+ memset(memremap(info->range_start, size), 0, size);
+ dprintf(1, "Space available for UMB: %x-%x, %x-%x\n"
+ , RomEnd, base, info->range_start, info->range_end);
+ }
// We should not give back unused high ram, to support some special
// guest OS, like oracle linux series.
--
2.27.0