From 314b80e0e9f8fee490b1d59a0c3db543513eb8be Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Fri, 26 Apr 2024 14:35:55 -0400
Subject: kernel: filedesc: Acquire mutex in write()

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/kern/kern_filedesc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/kern/kern_filedesc.c b/sys/kern/kern_filedesc.c
index 7e65d77..f7ca2c8 100644
--- a/sys/kern/kern_filedesc.c
+++ b/sys/kern/kern_filedesc.c
@@ -246,6 +246,7 @@ write(int fd, const void *buf, size_t count)
         return -EBADF;
     }
 
+    mutex_acquire(&desc->lock);
     if (desc->oflag != O_WRONLY && desc->oflag != O_WRONLY) {
         ret = -EACCES;
         goto cleanup;
@@ -271,6 +272,7 @@ write(int fd, const void *buf, size_t count)
         goto cleanup;
     }
 cleanup:
+    mutex_release(&desc->lock);
     dynfree(in_buf);
     return ret;
 }
-- 
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