NFS4: Avoid potential NULL pointer dereference in decode_and_add_ds().

On Mon, 17 Jan 2011, Mi Jinlong wrote:

>
>
> Jesper Juhl:
> > strrchr() can return NULL if nothing is found. If this happens we'll
> > dereference a NULL pointer in
> > fs/nfs/nfs4filelayoutdev.c::decode_and_add_ds().
> >
> > I tried to find some other code that guarantees that this can never
> > happen but I was unsuccessful. So, unless someone else can point to some
> > code that ensures this can never be a problem, I believe this patch is
> > needed.
> >
> > While I was changing this code I also noticed that all the dprintk()
> > statements, except one, start with "%s:". The one missing the ":" I added
> > it to.
>
>   Maybe another one also should be changed at decode_and_add_ds() at line 243:
>
>    243  printk("%s Decoded address and port %s\n", __func__, buf);
>
Missed that one. Thanks.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/nfs4filelayoutdev.c b/fs/nfs/nfs4filelayoutdev.c
index 51fe64ace55a34523f9f3d6fd461962e364c1b4e..f5c9b125e8ccee997a456bea20e87ae4dade07dd 100644 (file)
--- a/fs/nfs/nfs4filelayoutdev.c
+++ b/fs/nfs/nfs4filelayoutdev.c
@@ -214,7 +214,7 @@ decode_and_add_ds(__be32 **pp, struct inode *inode)
 
        /* ipv6 length plus port is legal */
        if (rlen > INET6_ADDRSTRLEN + 8) {
-               dprintk("%s Invalid address, length %d\n", __func__,
+               dprintk("%s: Invalid address, length %d\n", __func__,
                        rlen);
                goto out_err;
        }
@@ -225,6 +225,11 @@ decode_and_add_ds(__be32 **pp, struct inode *inode)
        /* replace the port dots with dashes for the in4_pton() delimiter*/
        for (i = 0; i < 2; i++) {
                char *res = strrchr(buf, '.');
+               if (!res) {
+                       dprintk("%s: Failed finding expected dots in port\n",
+                               __func__);
+                       goto out_free;
+               }
                *res = '-';
        }
 
@@ -240,7 +245,7 @@ decode_and_add_ds(__be32 **pp, struct inode *inode)
        port = htons((tmp[0] << 8) | (tmp[1]));
 
        ds = nfs4_pnfs_ds_add(inode, ip_addr, port);
-       dprintk("%s Decoded address and port %s\n", __func__, buf);
+       dprintk("%s: Decoded address and port %s\n", __func__, buf);
 out_free:
        kfree(buf);
 out_err: