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stge: fix null pointer dereference

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stge_attach() could fail at line 464, sc->sc_spec remains NULL when
calling stge_detach(), thus bus_release_resources() at line 704 will
trigger null pointer dereference. We need to check the nulliness before
calling bus_release_resources().

PR:		258420
Reviewed by:	markj
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D34629
This commit is contained in:
Tong Zhang 2022-03-31 14:16:55 -04:00 committed by Mark Johnston
parent 31190aa02e
commit 2108cc7290
1 changed files with 3 additions and 1 deletions
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4
sys/dev/stge/if_stge.c
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@ -699,7 +699,9 @@ stge_detach(device_t dev)
bus_teardown_intr(dev, sc->sc_res[1], sc->sc_ih);
sc->sc_ih = NULL;
}
bus_release_resources(dev, sc->sc_spec, sc->sc_res);
if (sc->sc_spec)
bus_release_resources(dev, sc->sc_spec, sc->sc_res);
mtx_destroy(&sc->sc_mii_mtx);
mtx_destroy(&sc->sc_mtx);