libkmod: use helper function to check for overflow

diff --git a/libkmod/libkmod-elf.c b/libkmod/libkmod-elf.c
index 8a8a73d97d81dc028b1825b142bdbc296196267b..4af829ecb6f1cf6bec8a343dea8dbcbb563015eb 100644 (file)
--- a/libkmod/libkmod-elf.c
+++ b/libkmod/libkmod-elf.c
@@ -250,8 +250,8 @@ static inline int elf_get_section_info(const struct kmod_elf *elf, uint16_t idx,
        }
 #undef READV
 
-       min_size = *offset + *size;
-       if (ULLONG_MAX - *offset < *size || min_size > elf->size) {
+       if (addu64_overflow(*offset, *size, &min_size)
+           || min_size > elf->size) {
                ELFDBG(elf, "out-of-bounds: %"PRIu64" >= %"PRIu64" (ELF size)\n",
                       min_size, elf->size);
                return -EINVAL;