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F-5760 - Only free standalone BIOs in ssl_set_bio to avoid chained free UAF

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aidan garske
2026-06-25 14:29:34 -07:00
parent 87863b1450
commit bfef0480fb
1 changed files with 3 additions and 3 deletions
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src/ssl.c
+3 -3
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@@ -6203,16 +6203,16 @@ int wolfSSL_set_compression(WOLFSSL* ssl)
* a chain */
if ((flags & WOLFSSL_BIO_FLAG_READ) && (ssl->biord != NULL)) {
if ((flags & WOLFSSL_BIO_FLAG_WRITE) && (ssl->biord != ssl->biowr)) {
if (ssl->biowr != NULL && ssl->biowr->prev != NULL)
if (ssl->biowr != NULL && ssl->biowr->prev == NULL)
wolfSSL_BIO_free(ssl->biowr);
ssl->biowr = NULL;
}
if (ssl->biord->prev != NULL)
if (ssl->biord->prev == NULL)
wolfSSL_BIO_free(ssl->biord);
ssl->biord = NULL;
}
else if ((flags & WOLFSSL_BIO_FLAG_WRITE) && (ssl->biowr != NULL)) {
if (ssl->biowr->prev != NULL)
if (ssl->biowr->prev == NULL)
wolfSSL_BIO_free(ssl->biowr);
ssl->biowr = NULL;
}