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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>
This commit is contained in:
Johannes Thumshirn 2015-08-17 13:03:02 +02:00 committed by James Bottomley
parent 6f3d828f5b
commit 612872cabf
1 changed files with 4 additions and 3 deletions
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7
drivers/scsi/lpfc/lpfc_mbox.c
View File

@ -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);
}