@@ -410,7 +410,6 @@ struct kmod_file *kmod_file_open(const struct kmod_ctx *ctx,
{
struct kmod_file *file = calloc(1, sizeof(struct kmod_file));
const struct comp_type *itr;
- size_t magic_size_max = 0;
int err = 0;
if (file == NULL)
@@ -422,22 +421,17 @@ struct kmod_file *kmod_file_open(const struct kmod_ctx *ctx,
goto error;
}
- for (itr = comp_types; itr->load != NULL; itr++) {
- if (magic_size_max < itr->magic_size)
- magic_size_max = itr->magic_size;
- }
-
- if (magic_size_max > 0) {
- char *buf = alloca(magic_size_max + 1);
+ {
+ char buf[7];
ssize_t sz;
- if (buf == NULL) {
- err = -errno;
- goto error;
- }
- sz = read_str_safe(file->fd, buf, magic_size_max + 1);
+ assert_cc(sizeof(magic_zstd) < sizeof(buf));
+ assert_cc(sizeof(magic_xz) < sizeof(buf));
+ assert_cc(sizeof(magic_zlib) < sizeof(buf));
+
+ sz = read_str_safe(file->fd, buf, sizeof(buf));
lseek(file->fd, 0, SEEK_SET);
- if (sz != (ssize_t)magic_size_max) {
+ if (sz != (sizeof(buf) - 1)) {
if (sz < 0)
err = sz;
else