[PATCH] drivers/isdn/eicon/eicon_idi.c: (2.5.17) dev_kfree_skb on wrong variable

["Adar Dembo" <adar@stanford.edu>]

Hello,

        The patch below changes one of the dev_kfree_skb() calls, which
incorrectly frees the wrong variable, and leaves some memory orphaned.
Specifically, in idi_send_data(), two skb's, "xmit_skb" and "skb2" are
allocated with alloc_skb. A check is made to see if either allocation
failed; if one did, whichever one (if at all) succeeded is
dev_kfree_skb()'d, and the function returns an error message. One of
these dev_kfree_skb() calls was freeing "skb" instead of "xmit_skb".

        Looking at the other calls to idi_send_data() and the rest of
the function, I believe "skb" should still be dev_kfree_skb()'d prior to
the return, but I am not 100% sure. The maintainer should look into this
and fix it if necessary.

-Adar Dembo

--- drivers/isdn/eicon/eicon_idi.c.orig 2002-05-20
22:07:28.000000000 -0700
+++ drivers/isdn/eicon/eicon_idi.c      2002-05-27
01:42:04.000000000 -0700
@@ -2972,7 +2972,7 @@
                        spin_unlock_irqrestore(&eicon_lock, flags);
                        eicon_log(card, 1, "idi_err: Ch%d: alloc_skb
failed in s
end_data()\n", chan->No);
                        if (xmit_skb)
-                               dev_kfree_skb(skb);
+                               dev_kfree_skb(xmit_skb);
                        if (skb2)
                                dev_kfree_skb(skb2);
                        return -ENOMEM;