git: 2108cc72906f - main - stge: fix null pointer dereference

[Mark Johnston]

The branch main has been updated by markj:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=2108cc72906f274f30306570268434c4f8d23636

commit 2108cc72906f274f30306570268434c4f8d23636
Author:     Tong Zhang <ztong0...@gmail.com>
AuthorDate: 2022-03-31 18:16:55 +0000
Commit:     Mark Johnston <ma...@freebsd.org>
CommitDate: 2022-03-31 19:54:56 +0000

    stge: fix null pointer dereference
    
    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
---
 sys/dev/stge/if_stge.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sys/dev/stge/if_stge.c b/sys/dev/stge/if_stge.c
index c9f71f01278c..a043ca9a6e80 100644
--- a/sys/dev/stge/if_stge.c
+++ b/sys/dev/stge/if_stge.c
@@ -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);