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[Qemu-trivial] [PATCH v2] qemu-sockets: do not test path with access() b

From: Paolo Bonzini
Subject: [Qemu-trivial] [PATCH v2] qemu-sockets: do not test path with access() before unlinking
Date: Wed, 4 Nov 2015 14:48:47 +0100

Using access() is a time-of-check/time-of-use race condition.  It is
okay to use them to provide better error messages, but that is pretty
much it.

This is not one such case; on the other hand, access() *will* skip
unlink() for a non-existent path, so ignore ENOENT return values from
the unlink() system call.

Signed-off-by: Paolo Bonzini <address@hidden>
 util/qemu-sockets.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
index 9142917..de9145a 100644
--- a/util/qemu-sockets.c
+++ b/util/qemu-sockets.c
@@ -751,8 +751,7 @@ int unix_listen_opts(QemuOpts *opts, Error **errp)
         qemu_opt_set(opts, "path", un.sun_path, &error_abort);
-    if ((access(un.sun_path, F_OK) == 0) &&
-        unlink(un.sun_path) < 0) {
+    if (unlink(un.sun_path) < 0 && errno != ENOENT) {
         error_setg_errno(errp, errno,
                          "Failed to unlink socket %s", un.sun_path);
         goto err;

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