dgram_pair_read_inner(): Do not move buf pointer if it is NULL

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19284)

diff --git a/crypto/bio/bss_dgram_pair.c b/crypto/bio/bss_dgram_pair.c
index 2b99f794e0664f438d92e400def3483a28fa3f2d..fedcd66dd35abced19fba65e97672ced695959aa 100644 (file)
--- a/crypto/bio/bss_dgram_pair.c
+++ b/crypto/bio/bss_dgram_pair.c
@@ -745,7 +745,8 @@ static size_t dgram_pair_read_inner(struct bio_dgram_pair_st *b, uint8_t *buf, s
 
         ring_buf_pop(&b->rbuf, src_len);
 
-        buf         += src_len;
+        if (buf != NULL)
+            buf += src_len;
         total_read  += src_len;
         sz          -= src_len;
     }