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libpq: If ALPN is not used, make PQsslAttribute(conn, "alpn") == ""

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The documentation says that PQsslAttribute(conn, "alpn") returns an
empty string if ALPN is not used, but the code actually returned
NULL. Fix the code to match the documentation.

Reported-by: Michael Paquier
Discussion: https://www.postgresql.org/message-id/ZideNHji0G4gxmc3@paquier.xyz
This commit is contained in:
Heikki Linnakangas
2024-04-29 12:26:46 +03:00
parent 592a228372
commit 3c18409265
2 changed files with 2 additions and 2 deletions
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2
src/interfaces/libpq/fe-secure-openssl.c
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@@ -1837,7 +1837,7 @@ PQsslAttribute(PGconn *conn, const char *attribute_name)
SSL_get0_alpn_selected(conn->ssl, &data, &len);
if (data == NULL || len == 0 || len > sizeof(alpn_str) - 1)
return NULL;
return "";
memcpy(alpn_str, data, len);
alpn_str[len] = 0;
return alpn_str;