From: Dāvis Mosāns Date: Fri, 21 Aug 2015 04:29:22 +0000 (+0300) Subject: mvsas: Fix NULL pointer dereference in mvs_slot_task_free X-Git-Tag: Ubuntu-5.2.0-15.16~10434^2~2 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=2280521719e81919283b82902ac24058f87dfc1b;p=mirror_ubuntu-eoan-kernel.git mvsas: Fix NULL pointer dereference in mvs_slot_task_free When pci_pool_alloc fails in mvs_task_prep then task->lldd_task stays NULL but it's later used in mvs_abort_task as slot which is passed to mvs_slot_task_free causing NULL pointer dereference. Just return from mvs_slot_task_free when passed with NULL slot. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=101891 Signed-off-by: Dāvis Mosāns Reviewed-by: Tomas Henzl Reviewed-by: Johannes Thumshirn Cc: stable@vger.kernel.org Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c index 454536c49315..9c780740fb82 100644 --- a/drivers/scsi/mvsas/mv_sas.c +++ b/drivers/scsi/mvsas/mv_sas.c @@ -887,6 +887,8 @@ static void mvs_slot_free(struct mvs_info *mvi, u32 rx_desc) static void mvs_slot_task_free(struct mvs_info *mvi, struct sas_task *task, struct mvs_slot_info *slot, u32 slot_idx) { + if (!slot) + return; if (!slot->task) return; if (!sas_protocol_ata(task->task_proto))