RootShell: synchronize accesses to single shell

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/app/src/main/java/com/wireguard/android/util/RootShell.java b/app/src/main/java/com/wireguard/android/util/RootShell.java
index 947a6679..f8b5bb9f 100644
--- a/app/src/main/java/com/wireguard/android/util/RootShell.java
+++ b/app/src/main/java/com/wireguard/android/util/RootShell.java
@@ -127,7 +127,7 @@ public class RootShell {
      * @param command Command to run as root.
      * @return The exit value of the last command run, or -1 if there was an internal error.
      */
-    public int run(final Collection<String> output, final String command)
+    public synchronized int run(final Collection<String> output, final String command)
             throws ErrnoException, IOException, NoRootException {
         ensureRoot();