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ANDROID: sdcardfs: Change current->fs under lock 

bug: 111641492

Change-Id: I79e9894f94880048edaf0f7cfa2d180f65cbcf3b
Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Daniel Rosenberg <drosen@google.com>
This commit is contained in:
Daniel Rosenberg 2018-07-20 16:11:40 -07:00 committed by syphyr
parent 669c5b32b5
commit d608ab83ba
1 changed files with 13 additions and 2 deletions
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15
fs/sdcardfs/inode.c
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@ -95,8 +95,11 @@ static int sdcardfs_create(struct inode *dir, struct dentry *dentry,
err = -ENOMEM;
goto out_unlock;
}
copied_fs->umask = 0;
task_lock(current);
current->fs = copied_fs;
current->fs->umask = 0;
task_unlock(current);
err = vfs_create2(lower_dentry_mnt, lower_parent_dentry->d_inode, lower_dentry, mode, want_excl);
if (err)
goto out;
@ -110,7 +113,9 @@ static int sdcardfs_create(struct inode *dir, struct dentry *dentry,
fixup_lower_ownership(dentry, dentry->d_name.name);
out:
task_lock(current);
current->fs = saved_fs;
task_unlock(current);
free_fs_struct(copied_fs);
out_unlock:
unlock_dir(lower_parent_dentry);
@ -312,8 +317,11 @@ static int sdcardfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode
unlock_dir(lower_parent_dentry);
goto out_unlock;
}
copied_fs->umask = 0;
task_lock(current);
current->fs = copied_fs;
current->fs->umask = 0;
task_unlock(current);
err = vfs_mkdir2(lower_mnt, lower_parent_dentry->d_inode, lower_dentry, mode);
if (err) {
@ -373,7 +381,10 @@ static int sdcardfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode
}
}
out:
task_lock(current);
current->fs = saved_fs;
task_unlock(current);
free_fs_struct(copied_fs);
out_unlock:
sdcardfs_put_lower_path(dentry, &lower_path);