diff mbox series

[PULL,01/10] util: Remove redundant checks in the openpty()

Message ID 20210916141026.1174822-2-laurent@vivier.eu
State New
Headers show
Series [PULL,01/10] util: Remove redundant checks in the openpty() | expand

Commit Message

Laurent Vivier Sept. 16, 2021, 2:10 p.m. UTC 
From: AlexChen <alex.chen@huawei.com>

As we can see from the following function call stack, amaster and aslave
can not be NULL: char_pty_open() -> qemu_openpty_raw() -> openpty().
In addition, according to the API specification for openpty():
https://www.gnu.org/software/libc/manual/html_node/Pseudo_002dTerminal-Pairs.html,
the arguments name, termp and winp can all be NULL, but arguments amaster or aslave
can not be NULL.
Finally, amaster and aslave has been dereferenced at the beginning of the openpty().
So the checks on amaster and aslave in the openpty() are redundant. Remove them.

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Alex Chen <alex.chen@huawei.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <5F9FE5B8.1030803@huawei.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
 util/qemu-openpty.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/util/qemu-openpty.c b/util/qemu-openpty.c
index eb17f5b0bcec..427f43a76973 100644
--- a/util/qemu-openpty.c
+++ b/util/qemu-openpty.c
@@ -80,10 +80,9 @@  static int openpty(int *amaster, int *aslave, char *name,
             (termp != NULL && tcgetattr(sfd, termp) < 0))
                 goto err;
 
-        if (amaster)
-                *amaster = mfd;
-        if (aslave)
-                *aslave = sfd;
+        *amaster = mfd;
+        *aslave = sfd;
+
         if (winp)
                 ioctl(sfd, TIOCSWINSZ, winp);