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- From f7fa1d461aa71bbc8a6c23fdcfc305f2e52ce5dd Mon Sep 17 00:00:00 2001
- From: Christopher Faulet <cfaulet@haproxy.com>
- Date: Mon, 19 Feb 2018 14:25:15 +0100
- Subject: [PATCH] BUG/MEDIUM: ssl: Shutdown the connection for reading on
- SSL_ERROR_SYSCALL
-
- When SSL_read returns SSL_ERROR_SYSCALL and errno is unset or set to EAGAIN, the
- connection must be shut down for reading. Else, the connection loops infinitly,
- consuming all the CPU.
-
- The bug was introduced in the commit 7e2e50500 ("BUG/MEDIUM: ssl: Don't always
- treat SSL_ERROR_SYSCALL as unrecovarable."). This patch must be backported in
- 1.8 too.
-
- (cherry picked from commit 4ac77a98cda3d0f9b1d9de7bbbda2c91357f0767)
- Signed-off-by: Willy Tarreau <w@1wt.eu>
- ---
- src/ssl_sock.c | 14 ++++++++------
- 1 file changed, 8 insertions(+), 6 deletions(-)
-
- diff --git a/src/ssl_sock.c b/src/ssl_sock.c
- index f118724..a065bbb 100644
- --- a/src/ssl_sock.c
- +++ b/src/ssl_sock.c
- @@ -5437,10 +5437,9 @@ static int ssl_sock_to_buf(struct connection *conn, struct buffer *buf, int coun
- break;
- } else if (ret == SSL_ERROR_ZERO_RETURN)
- goto read0;
- - /* For SSL_ERROR_SYSCALL, make sure the error is
- - * unrecoverable before flagging the connection as
- - * in error.
- - */
- + /* For SSL_ERROR_SYSCALL, make sure to clear the error
- + * stack before shutting down the connection for
- + * reading. */
- if (ret == SSL_ERROR_SYSCALL && (!errno || errno == EAGAIN))
- goto clear_ssl_error;
- /* otherwise it's a real error */
- @@ -5453,16 +5452,19 @@ static int ssl_sock_to_buf(struct connection *conn, struct buffer *buf, int coun
- conn_cond_update_sock_polling(conn);
- return done;
-
- + clear_ssl_error:
- + /* Clear openssl global errors stack */
- + ssl_sock_dump_errors(conn);
- + ERR_clear_error();
- read0:
- conn_sock_read0(conn);
- goto leave;
- +
- out_error:
- conn->flags |= CO_FL_ERROR;
- -clear_ssl_error:
- /* Clear openssl global errors stack */
- ssl_sock_dump_errors(conn);
- ERR_clear_error();
- -
- goto leave;
- }
-
- --
- 1.7.10.4
-
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