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Avoid reentrantly sending on the same socket, which causes a kernel panic.

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This commit is contained in:
Archie Cobbs 2002-01-06 01:08:30 +00:00
parent f8efde8991
commit dc9c2e0149
1 changed files with 9 additions and 0 deletions
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9
sys/netgraph/ng_ksocket.c
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@ -95,6 +95,7 @@ typedef struct ng_ksocket_private *priv_p;
#define KSF_EOFSEEN 0x00000004 /* Have sent 0-length EOF mbuf */
#define KSF_CLONED 0x00000008 /* Cloned from an accepting socket */
#define KSF_EMBRYONIC 0x00000010 /* Cloned node with no hooks yet */
#define KSF_SENDING 0x00000020 /* Sending on socket */
/* Netgraph node methods */
static ng_constructor_t ng_ksocket_constructor;
@ -891,6 +892,12 @@ ng_ksocket_rcvdata(hook_p hook, item_p item)
int error;
struct mbuf *m;
/* Avoid reentrantly sending on the socket */
if ((priv->flags & KSF_SENDING) != 0) {
NG_FREE_ITEM(item);
return (EDEADLK);
}
/* Extract data and meta information */
NGI_GET_M(item, m);
NGI_GET_META(item, meta);
@ -914,7 +921,9 @@ ng_ksocket_rcvdata(hook_p hook, item_p item)
}
/* Send packet */
priv->flags |= KSF_SENDING;
error = (*so->so_proto->pr_usrreqs->pru_sosend)(so, sa, 0, m, 0, 0, td);
priv->flags &= ~KSF_SENDING;
/* Clean up and exit */
NG_FREE_META(meta);