Avoid dangling ptrs in header and data params for PEM_read_bio_ex

In the event of a failure in PEM_read_bio_ex() we free the buffers we allocated for the header and data buffers. However we were not clearing the ptrs stored in *header and *data. Since, on success, the caller is responsible for freeing these ptrs this can potentially lead to a double free if the caller frees them even on failure. Thanks to Dawei Wang for reporting this issue. Based on a proposed patch by Kurt Roeckx. CVE-2022-4450 Reviewed-by: Paul Dale <pauli@openssl.org> Reviewed-by: Hugo Landau <hlandau@openssl.org>
openssl · Feb 3, 2023 · bbcf509 · bbcf509
1 parent 43d8f88
commit bbcf509
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/crypto/pem/pem_lib.c b/crypto/pem/pem_lib.c
@@ -957,7 +957,9 @@ int PEM_read_bio_ex(BIO *bp, char **name_out, char **header,
     *data = pem_malloc(len, flags);
     if (*header == NULL || *data == NULL) {
         pem_free(*header, flags, 0);
+        *header = NULL;
         pem_free(*data, flags, 0);
+        *data = NULL;
         goto end;
     }
     BIO_read(headerB, *header, headerlen);