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ionic: catch NULL pointer issue on reconfig

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It's possible that the driver will dereference a qcq that doesn't exist
when calling ionic_reconfigure_queues(), which causes a page fault BUG.

If a reduction in the number of queues is followed by a different
reconfig such as changing the ring size, the driver can hit a NULL
pointer when trying to clean up non-existent queues.

Fix this by checking to make sure both the qcqs array and qcq entry
exists bofore trying to use and free the entry.

Fixes: 101b40a017 ("ionic: change queue count with no reset")
Signed-off-by: Brett Creeley <brett@pensando.io>
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Link: https://lore.kernel.org/r/20221017233123.15869-1-snelson@pensando.io
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Brett Creeley 2022-10-17 16:31:23 -07:00 committed by Jakub Kicinski
parent d8b57135fd
commit aa1d7e1267
1 changed files with 8 additions and 4 deletions
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12
drivers/net/ethernet/pensando/ionic/ionic_lif.c
View file

@ -2817,11 +2817,15 @@ int ionic_reconfigure_queues(struct ionic_lif *lif,
* than the full array, but leave the qcq shells in place
*/
for (i = lif->nxqs; i < lif->ionic->ntxqs_per_lif; i++) {
lif->txqcqs[i]->flags &= ~IONIC_QCQ_F_INTR;
ionic_qcq_free(lif, lif->txqcqs[i]);
if (lif->txqcqs && lif->txqcqs[i]) {
lif->txqcqs[i]->flags &= ~IONIC_QCQ_F_INTR;
ionic_qcq_free(lif, lif->txqcqs[i]);
}
lif->rxqcqs[i]->flags &= ~IONIC_QCQ_F_INTR;
ionic_qcq_free(lif, lif->rxqcqs[i]);
if (lif->rxqcqs && lif->rxqcqs[i]) {
lif->rxqcqs[i]->flags &= ~IONIC_QCQ_F_INTR;
ionic_qcq_free(lif, lif->rxqcqs[i]);
}
}
if (err)