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Make sure musycc driver deals with the possibility of any type of mbuf 

allocation not succeeding.

In this case, make sure the driver doesn't leak any memory by freeing all
necessary buffers; make sure to loop and free all the previously allocated
mbufs in this routine.

Reviewed by: alfred
This commit is contained in:
Bosko Milekic 2001-01-06 20:44:39 +00:00
parent f8761e53a7
commit e1a0b830b5
1 changed files with 20 additions and 0 deletions
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20
sys/dev/musycc/musycc.c
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@ -1204,7 +1204,17 @@ musycc_connect(hook_p hook)
sc->mdt[ch][i].data = 0;
MGETHDR(m, M_TRYWAIT, MT_DATA);
if (m == NULL)
goto errfree;
MCLGET(m, M_TRYWAIT);
if ((m->m_flags M_EXT) == 0) {
/* We've waited mbuf_wait and still got nothing.
We're calling with M_TRYWAIT anyway - a little
defensive programming costs us very little - if
anything at all in the case of error. */
m_free(m);
goto errfree;
}
sc->mdr[ch][i].m = m;
sc->mdr[ch][i].data = vtophys(m->m_data);
sc->mdr[ch][i].status = 1600; /* MTU */
@ -1224,6 +1234,16 @@ musycc_connect(hook_p hook)
hook->peer->flags |= HK_QUEUE;
return (0);
errfree:
while (i > 0) {
/* Don't leak all the previously allocated mbufs in this loop */
i--;
m_free(sc->mdr[ch][i].m);
}
FREE(sc->mdt[ch], M_MUSYCC);
FREE(sc->mdr[ch], M_MUSYCC);
return (ENOBUFS);
}
static int