chardev/char-socket: tcp_chr_recv: don't clobber errno

tcp_chr_recv communicates the specific error condition to the caller via
errno.  However, after setting it, it may call into some system calls or
library functions which can clobber the errno.

Avoid this by moving the errno assignment to the end of the function.

Signed-off-by: Roman Kagan <rvkagan@yandex-team.ru>
Message-Id: <20211111153354.18807-3-rvkagan@yandex-team.ru>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>

diff --git a/chardev/char-socket.c b/chardev/char-socket.c
index d619088232d30ccb1e60c8e650b45942968175b4..3ddd98ed495651bbed2fb38cae381d1a053927a6 100644 (file)
--- a/chardev/char-socket.c
+++ b/chardev/char-socket.c
@@ -290,13 +290,6 @@ static ssize_t tcp_chr_recv(Chardev *chr, char *buf, size_t len)
                                      NULL);
     }
 
-    if (ret == QIO_CHANNEL_ERR_BLOCK) {
-        errno = EAGAIN;
-        ret = -1;
-    } else if (ret == -1) {
-        errno = EIO;
-    }
-
     if (msgfds_num) {
         /* close and clean read_msgfds */
         for (i = 0; i < s->read_msgfds_num; i++) {
@@ -325,6 +318,13 @@ static ssize_t tcp_chr_recv(Chardev *chr, char *buf, size_t len)
 #endif
     }
 
+    if (ret == QIO_CHANNEL_ERR_BLOCK) {
+        errno = EAGAIN;
+        ret = -1;
+    } else if (ret == -1) {
+        errno = EIO;
+    }
+
     return ret;
 }