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