From 612872cabf5be6f95d43d9a88eef38201ae8005d Mon Sep 17 00:00:00 2001 From: Johannes Thumshirn <jthumshirn@suse.de> Date: Mon, 17 Aug 2015 13:03:02 +0200 Subject: [PATCH] lpfc: Fix possible use-after-free and double free in lpfc_mbx_cmpl_rdp_page_a2() If the bf_get() call in lpfc_mbx_cmpl_rdp_page_a2() does succeeds, execution continues normally and mp gets kfree()d. If the subsequent call to lpfc_sli_issue_mbox() fails execution jumps to the error label where lpfc_mbuf_free() is called with mp->virt and mp->phys as function arguments. This is the use after free. Following the use after free mp gets kfree()d again which is a double free. Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> Acked-by: James Smart <james.smart@avagotech.com> Signed-off-by: James Bottomley <JBottomley@Odin.com> --- drivers/scsi/lpfc/lpfc_mbox.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_mbox.c b/drivers/scsi/lpfc/lpfc_mbox.c index eb627724417e14..4abb93a83e0ffa 100644 --- a/drivers/scsi/lpfc/lpfc_mbox.c +++ b/drivers/scsi/lpfc/lpfc_mbox.c @@ -2284,7 +2284,7 @@ lpfc_mbx_cmpl_rdp_page_a2(struct lpfc_hba *phba, LPFC_MBOXQ_t *mbox) (struct lpfc_rdp_context *)(mbox->context2); if (bf_get(lpfc_mqe_status, &mbox->u.mqe)) - goto error; + goto error_mbuf_free; lpfc_sli_bemem_bcopy(mp->virt, &rdp_context->page_a2, DMP_SFF_PAGE_A2_SIZE); @@ -2299,13 +2299,14 @@ lpfc_mbx_cmpl_rdp_page_a2(struct lpfc_hba *phba, LPFC_MBOXQ_t *mbox) mbox->mbox_cmpl = lpfc_mbx_cmpl_rdp_link_stat; mbox->context2 = (struct lpfc_rdp_context *) rdp_context; if (lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT) == MBX_NOT_FINISHED) - goto error; + goto error_cmd_free; return; -error: +error_mbuf_free: lpfc_mbuf_free(phba, mp->virt, mp->phys); kfree(mp); +error_cmd_free: lpfc_sli4_mbox_cmd_free(phba, mbox); rdp_context->cmpl(phba, rdp_context, FAILURE); } -- GitLab