[PATCH] fuse: fix Oops in lookup

Fix bug in certain error paths of lookup routines.  The request object was
reused for sending FORGET, which is illegal.  This bug could cause an Oops
in 2.6.18.  In earlier versions it might silently corrupt memory, but this
is very unlikely.

These error paths are never triggered by libfuse, so this wasn't noticed
even with the 2.6.18 kernel, only with a filesystem using the raw kernel
interface.

Thanks to Russ Cox for the bug report and test filesystem.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
[chrisw: backport to 2.6.18 -stable]
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 5d7c726be186a2da8446b6dca5d31ffcfce0698d..f75deebbf64acaea0cd74b50386d9e3c8180b0af 100644 (file)
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -138,6 +138,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
                struct fuse_entry_out outarg;
                struct fuse_conn *fc;
                struct fuse_req *req;
+               struct fuse_req *forget_req;
 
                /* Doesn't hurt to "reset" the validity timeout */
                fuse_invalidate_entry_cache(entry);
@@ -151,21 +152,29 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
                if (IS_ERR(req))
                        return 0;
 
+               forget_req = fuse_get_req(fc);
+               if (IS_ERR(forget_req)) {
+                       fuse_put_request(fc, req);
+                       return 0;
+               }
+
                fuse_lookup_init(req, entry->d_parent->d_inode, entry, &outarg);
                request_send(fc, req);
                err = req->out.h.error;
+               fuse_put_request(fc, req);
                /* Zero nodeid is same as -ENOENT */
                if (!err && !outarg.nodeid)
                        err = -ENOENT;
                if (!err) {
                        struct fuse_inode *fi = get_fuse_inode(inode);
                        if (outarg.nodeid != get_node_id(inode)) {
-                               fuse_send_forget(fc, req, outarg.nodeid, 1);
+                               fuse_send_forget(fc, forget_req,
+                                                outarg.nodeid, 1);
                                return 0;
                        }
                        fi->nlookup ++;
                }
-               fuse_put_request(fc, req);
+               fuse_put_request(fc, forget_req);
                if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
                        return 0;
 
@@ -214,6 +223,7 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
        struct inode *inode = NULL;
        struct fuse_conn *fc = get_fuse_conn(dir);
        struct fuse_req *req;
+       struct fuse_req *forget_req;
 
        if (entry->d_name.len > FUSE_NAME_MAX)
                return ERR_PTR(-ENAMETOOLONG);
@@ -222,9 +232,16 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
        if (IS_ERR(req))
                return ERR_PTR(PTR_ERR(req));
 
+       forget_req = fuse_get_req(fc);
+       if (IS_ERR(forget_req)) {
+               fuse_put_request(fc, req);
+               return ERR_PTR(PTR_ERR(forget_req));
+       }
+
        fuse_lookup_init(req, dir, entry, &outarg);
        request_send(fc, req);
        err = req->out.h.error;
+       fuse_put_request(fc, req);
        /* Zero nodeid is same as -ENOENT, but with valid timeout */
        if (!err && outarg.nodeid &&
            (invalid_nodeid(outarg.nodeid) || !valid_mode(outarg.attr.mode)))
@@ -233,11 +250,11 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
                inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
                                  &outarg.attr);
                if (!inode) {
-                       fuse_send_forget(fc, req, outarg.nodeid, 1);
+                       fuse_send_forget(fc, forget_req, outarg.nodeid, 1);
                        return ERR_PTR(-ENOMEM);
                }
        }
-       fuse_put_request(fc, req);
+       fuse_put_request(fc, forget_req);
        if (err && err != -ENOENT)
                return ERR_PTR(err);
 
@@ -375,6 +392,13 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
        struct fuse_entry_out outarg;
        struct inode *inode;
        int err;
+       struct fuse_req *forget_req;
+
+       forget_req = fuse_get_req(fc);
+       if (IS_ERR(forget_req)) {
+               fuse_put_request(fc, req);
+               return PTR_ERR(forget_req);
+       }
 
        req->in.h.nodeid = get_node_id(dir);
        req->out.numargs = 1;
@@ -382,24 +406,24 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
        req->out.args[0].value = &outarg;
        request_send(fc, req);
        err = req->out.h.error;
-       if (err) {
-               fuse_put_request(fc, req);
-               return err;
-       }
+       fuse_put_request(fc, req);
+       if (err)
+               goto out_put_forget_req;
+
        err = -EIO;
        if (invalid_nodeid(outarg.nodeid))
-               goto out_put_request;
+               goto out_put_forget_req;
 
        if ((outarg.attr.mode ^ mode) & S_IFMT)
-               goto out_put_request;
+               goto out_put_forget_req;
 
        inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
                          &outarg.attr);
        if (!inode) {
-               fuse_send_forget(fc, req, outarg.nodeid, 1);
+               fuse_send_forget(fc, forget_req, outarg.nodeid, 1);
                return -ENOMEM;
        }
-       fuse_put_request(fc, req);
+       fuse_put_request(fc, forget_req);
 
        if (dir_alias(inode)) {
                iput(inode);
@@ -411,8 +435,8 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
        fuse_invalidate_attr(dir);
        return 0;
 
- out_put_request:
-       fuse_put_request(fc, req);
+ out_put_forget_req:
+       fuse_put_request(fc, forget_req);
        return err;
 }