diff options
| author | James Smart <jsmart2021@gmail.com> | 2021-04-12 04:31:18 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-04-13 08:39:13 +0300 |
| commit | 724f6b43a3492b02e2ebc88f9fb749d1405098e2 (patch) | |
| tree | eb5790b6568fe9906c92488135890e3679bc2336 | |
| parent | 304ee43238fed517faa123e034b593905b8679f8 (diff) | |
| download | linux-724f6b43a3492b02e2ebc88f9fb749d1405098e2.tar.xz | |
scsi: lpfc: Fix use-after-free on unused nodes after port swap
During target port swap, the swap logic ignores the DROPPED flag in the
nodes. As a node then moves into the UNUSED state, the reference count will
be dropped. If a node is later reused and moved out of the UNUSED state, an
access can result in a use-after-free assert.
Fix by having the port swap logic propagate the DROPPED flag when switching
nodes. This will avoid reference from being dropped.
Link: https://lore.kernel.org/r/20210412013127.2387-8-jsmart2021@gmail.com
Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_els.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c index ed57d92e96e1..c919bedd931c 100644 --- a/drivers/scsi/lpfc/lpfc_els.c +++ b/drivers/scsi/lpfc/lpfc_els.c @@ -1691,6 +1691,15 @@ lpfc_plogi_confirm_nport(struct lpfc_hba *phba, uint32_t *prsp, else new_ndlp->nlp_flag &= ~NLP_RPI_REGISTERED; + /* + * Retain the DROPPED flag. This will take care of the init + * refcount when affecting the state change + */ + if (keep_new_nlp_flag & NLP_DROPPED) + new_ndlp->nlp_flag |= NLP_DROPPED; + else + new_ndlp->nlp_flag &= ~NLP_DROPPED; + ndlp->nlp_flag = keep_new_nlp_flag; /* if ndlp had NLP_UNREG_INP set, keep it */ @@ -1705,6 +1714,15 @@ lpfc_plogi_confirm_nport(struct lpfc_hba *phba, uint32_t *prsp, else ndlp->nlp_flag &= ~NLP_RPI_REGISTERED; + /* + * Retain the DROPPED flag. This will take care of the init + * refcount when affecting the state change + */ + if (keep_nlp_flag & NLP_DROPPED) + ndlp->nlp_flag |= NLP_DROPPED; + else + ndlp->nlp_flag &= ~NLP_DROPPED; + spin_unlock_irq(&new_ndlp->lock); spin_unlock_irq(&ndlp->lock); |