From: Tobias Stoeckmann <tobias@stoeckmann.org>
Date: Tue, 15 Oct 2024 16:19:32 +0000 (+0200)
Subject: libkmod: Add another section size check
X-Git-Tag: v34~221
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c40627f927c945717b35c8c79e07912b3a702a33;p=thirdparty%2Fkmod.git

libkmod: Add another section size check

Make sure that section is actually large enough to hold a 32 bit value.

Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Link: https://github.com/kmod-project/kmod/pull/181
Signed-off-by: Lucas De Marchi <lucas.de.marchi@gmail.com>
---

diff --git a/libkmod/libkmod-elf.c b/libkmod/libkmod-elf.c
index 3e97aaa2..d381e365 100644
--- a/libkmod/libkmod-elf.c
+++ b/libkmod/libkmod-elf.c
@@ -781,7 +781,7 @@ static uint64_t kmod_elf_resolve_crc(const struct kmod_elf *elf, uint64_t crc,
 		return (uint64_t)-1;
 	}
 
-	if (crc > (size - sizeof(uint32_t))) {
+	if (size < sizeof(uint32_t) || crc > (size - sizeof(uint32_t))) {
 		ELFDBG(elf,
 		       "CRC offset %" PRIu64 " is too big, section %" PRIu16
 		       " size is %" PRIu64 "\n",