Fix bug #67326 fileinfo: cdf_read_short_sector insufficient boundary check

Upstream fix https://github.com/file/file/commit/6d209c1c489457397a5763bca4b28e43aac90391.patch
Only revelant part applied

diff --git a/ext/fileinfo/libmagic/cdf.c b/ext/fileinfo/libmagic/cdf.c
index 4712e84942eae72ce63a85a5ea5109cfd7ffe386..16649f193fbce5336369f30ce23cad3fd24f87aa 100644 (file)
--- a/ext/fileinfo/libmagic/cdf.c
+++ b/ext/fileinfo/libmagic/cdf.c
@@ -365,10 +365,10 @@ cdf_read_short_sector(const cdf_stream_t *sst, void *buf, size_t offs,
        size_t ss = CDF_SHORT_SEC_SIZE(h);
        size_t pos = CDF_SHORT_SEC_POS(h, id);
        assert(ss == len);
-       if (pos > CDF_SEC_SIZE(h) * sst->sst_len) {
+       if (pos + len > CDF_SEC_SIZE(h) * sst->sst_len) {
                DPRINTF(("Out of bounds read %" SIZE_T_FORMAT "u > %"
                    SIZE_T_FORMAT "u\n",
-                   pos, CDF_SEC_SIZE(h) * sst->sst_len));
+                   pos + len, CDF_SEC_SIZE(h) * sst->sst_len));
                return -1;
        }
        (void)memcpy(((char *)buf) + offs,