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From 2cd3bb50e256f5ed5f611ac611d25fe673f2cec3 Mon Sep 17 00:00:00 2001
From: Peter Johnson <johnson.peter@gmail.com>
Date: Fri, 11 Aug 2023 10:49:51 +0000
Subject: [PATCH] elf.c: Fix NULL deref on bad xsize expression (#234)
CVE: CVE-2023-37732
Upstream-Status: Backport [https://github.com/yasm/yasm/commit/2cd3bb50e256f5ed5f611ac611d25fe673f2cec3]
Signed-off-by: Soumya <soumya.sambu@windriver.com>
---
modules/objfmts/elf/elf.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/modules/objfmts/elf/elf.c b/modules/objfmts/elf/elf.c
index 2486bba8..bab4c9ca 100644
--- a/modules/objfmts/elf/elf.c
+++ b/modules/objfmts/elf/elf.c
@@ -482,15 +482,15 @@ elf_symtab_write_to_file(FILE *f, elf_symtab_head *symtab,
/* get size (if specified); expr overrides stored integer */
if (entry->xsize) {
- size_intn = yasm_intnum_copy(
- yasm_expr_get_intnum(&entry->xsize, 1));
- if (!size_intn) {
+ yasm_intnum *intn = yasm_expr_get_intnum(&entry->xsize, 1);
+ if (!intn) {
yasm_error_set(YASM_ERROR_VALUE,
N_("size specifier not an integer expression"));
yasm_errwarn_propagate(errwarns, entry->xsize->line);
- }
+ } else
+ size_intn = yasm_intnum_copy(intn);
}
- else
+ if (!size_intn)
size_intn = yasm_intnum_create_uint(entry->size);
/* get EQU value for constants */
--
2.40.0
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