proc: protect mm start_code/end_code in /proc/pid/stat

[firefly-linux-kernel-4.4.55.git] / fs / 9p / vfs_inode.c

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 0afbbb450faf8a9892b4cc88e484df4296c0ff9c..7f6c6770319538c3094f7b26eb40fc18a398475d 100644 (file)
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -652,7 +652,8 @@ v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
        if (nd && nd->flags & LOOKUP_OPEN) {
                v9inode = V9FS_I(dentry->d_inode);
                mutex_lock(&v9inode->v_mutex);
-               if (v9ses->cache && !v9inode->writeback_fid) {
+               if (v9ses->cache && !v9inode->writeback_fid &&
+                   ((flags & O_ACCMODE) != O_RDONLY)) {
                        /*
                         * clone a fid and add it to writeback_fid
                         * we do it during open time instead of
@@ -935,7 +936,7 @@ v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
 
        P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
        err = -EPERM;
-       v9ses = v9fs_inode2v9ses(dentry->d_inode);
+       v9ses = v9fs_dentry2v9ses(dentry);
        if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
                generic_fillattr(dentry->d_inode, stat);
                return 0;
@@ -976,7 +977,7 @@ static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
                return retval;
 
        retval = -EPERM;
-       v9ses = v9fs_inode2v9ses(dentry->d_inode);
+       v9ses = v9fs_dentry2v9ses(dentry);
        fid = v9fs_fid_lookup(dentry);
        if(IS_ERR(fid))
                return PTR_ERR(fid);
@@ -1138,7 +1139,7 @@ static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
 
        P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
        retval = -EPERM;
-       v9ses = v9fs_inode2v9ses(dentry->d_inode);
+       v9ses = v9fs_dentry2v9ses(dentry);
        fid = v9fs_fid_lookup(dentry);
        if (IS_ERR(fid))
                return PTR_ERR(fid);