From f5b5210cd6c6f62f012c9fd894f5e2a2bb328cb0 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Fri, 26 Apr 2024 14:37:22 -0400
Subject: kernel: filedesc: Acquire mutex in read()
Signed-off-by: Ian Moffett <ian@osmora.org>
---
sys/kern/kern_filedesc.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/sys/kern/kern_filedesc.c b/sys/kern/kern_filedesc.c
index f7ca2c8..203eefc 100644
--- a/sys/kern/kern_filedesc.c
+++ b/sys/kern/kern_filedesc.c
@@ -331,19 +331,24 @@ read(int fd, void *buf, size_t count)
return -EBADF;
}
+ mutex_acquire(&fd_desc->lock);
if (fd_desc->oflag == O_WRONLY) {
- return -EACCES;
+ bytes_read = -EACCES;
+ goto done;
}
sio.offset = fd_desc->offset;
vnode = fd_desc->vnode;
if (count > MAX_RW_SIZE) {
- return -EINVAL;
+ bytes_read = -EACCES;
+ goto done;
}
bytes_read = vfs_read(vnode, &sio);
fd_desc->offset += bytes_read;
+done:
+ mutex_release(&fd_desc->lock);
return bytes_read;
}
--
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