hfsplus: fix Buffer overflow with a corrupted image

[linux-kernel-docs/linux-2.4.36.git] / ipc / shm.c

diff --git a/ipc/shm.c b/ipc/shm.c
index 1df0577..36cb09a 100644 (file)
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -161,6 +161,8 @@ static int shm_mmap(struct file * file, struct vm_area_struct * vma)
 {
        UPDATE_ATIME(file->f_dentry->d_inode);
        vma->vm_ops = &shm_vm_ops;
+       if (!(vma->vm_flags & VM_WRITE))
+               vma->vm_flags &= ~VM_MAYWRITE;
        shm_inc(file->f_dentry->d_inode->i_ino);
        return 0;
 }