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From c22d38baefc5a7a1e1f5cdc9dbb556b1f0ec5c57 Mon Sep 17 00:00:00 2001
From: Nick Clifton <nickc@redhat.com>
Date: Thu, 30 Mar 2023 10:10:09 +0100
Subject: [PATCH] Fix an illegal memory access when an accessing a
zer0-lengthverdef table.
PR 30285
* elf.c (_bfd_elf_slurp_version_tables): Fail if no version definitions are allocated.
CVE: CVE-2023-1972
Upstream-Status: Backport
Signed-off-by: Ross Burton <ross.burton@arm.com>
---
bfd/ChangeLog | 6 ++++++
bfd/elf.c | 5 +++++
2 files changed, 11 insertions(+)
diff --git a/bfd/elf.c b/bfd/elf.c
index 027d0143735..185028cbd97 100644
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -9030,6 +9030,9 @@ _bfd_elf_slurp_version_tables (bfd *abfd, bool default_imported_symver)
bfd_set_error (bfd_error_file_too_big);
goto error_return_verdef;
}
+
+ if (amt == 0)
+ goto error_return_verdef;
elf_tdata (abfd)->verdef = (Elf_Internal_Verdef *) bfd_zalloc (abfd, amt);
if (elf_tdata (abfd)->verdef == NULL)
goto error_return_verdef;
@@ -9133,6 +9136,8 @@ _bfd_elf_slurp_version_tables (bfd *abfd, bool default_imported_symver)
bfd_set_error (bfd_error_file_too_big);
goto error_return;
}
+ if (amt == 0)
+ goto error_return;
elf_tdata (abfd)->verdef = (Elf_Internal_Verdef *) bfd_zalloc (abfd, amt);
if (elf_tdata (abfd)->verdef == NULL)
goto error_return;
--
2.34.1
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