33 lines
1.2 KiB
Diff
33 lines
1.2 KiB
Diff
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https://bugzilla.redhat.com/show_bug.cgi?id=1085663
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Reported-by: Florian Weimer <fweimer at redhat.com>
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Signed-off-by: Mark Wielaard <mjw at redhat.com>
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---
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libdw/dwarf_begin_elf.c | 8 +++++++-
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2 files changed, 12 insertions(+), 1 deletions(-)
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diff --git a/libdw/dwarf_begin_elf.c b/libdw/dwarf_begin_elf.c
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index 79daeac..34ea373 100644
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--- a/libdw/dwarf_begin_elf.c
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+++ b/libdw/dwarf_begin_elf.c
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@@ -1,5 +1,5 @@
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/* Create descriptor from ELF descriptor for processing file.
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- Copyright (C) 2002-2011 Red Hat, Inc.
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+ Copyright (C) 2002-2011, 2014 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper at redhat.com>, 2002.
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@@ -282,6 +282,12 @@ check_section (Dwarf *result, GElf_Ehdr *ehdr, Elf_Scn *scn, bool inscngrp)
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memcpy (&size, data->d_buf + 4, sizeof size);
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size = be64toh (size);
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+ /* Check for unsigned overflow so malloc always allocated
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+ enough memory for both the Elf_Data header and the
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+ uncompressed section data. */
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+ if (unlikely (sizeof (Elf_Data) + size < size))
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+ break;
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+
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Elf_Data *zdata = malloc (sizeof (Elf_Data) + size);
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if (unlikely (zdata == NULL))
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break;
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