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| author | James Smart <jsmart2021@gmail.com> | 2019-05-22 02:48:59 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2019-06-19 01:46:21 +0200 |
| commit | 51d23fb28ccb355ee4d26dedacca24c171c2f664 (patch) | |
| tree | 244cede07ab0daea39724fc51adfa1cd3583abdd /drivers/scsi/lpfc/lpfc_nvmet.c | |
| parent | scsi: lpfc: Fix PT2PT PLOGI collison stopping discovery (diff) | |
| download | linux-51d23fb28ccb355ee4d26dedacca24c171c2f664.tar.xz linux-51d23fb28ccb355ee4d26dedacca24c171c2f664.zip | |
scsi: lpfc: Prevent 'use after free' memory overwrite in nvmet LS handling
Use-after-free memory overwrite detected. Problem reported
by Ewan Milne at Red Hat after running lpfc target with additional
memory checking enabled.
Race condition when lpfc_nvmet_xmt_ls_rsp_cmp frees the ctxp
memory in interrupt context before lpfc_nvmet_xmt_ls_rsp
clears a field in the ctxp after successfully issuing the wqe.
Remove the unnecessary ctxp write after reposting the rq buffer. The
ctxp->rqb_buffer field is not checked in LS handling after the wqe
is submitted.
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Reported-by: Ewan Milne <emilne@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/lpfc/lpfc_nvmet.c')
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_nvmet.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/scsi/lpfc/lpfc_nvmet.c b/drivers/scsi/lpfc/lpfc_nvmet.c index a943b2a20001..08c2c4e3515b 100644 --- a/drivers/scsi/lpfc/lpfc_nvmet.c +++ b/drivers/scsi/lpfc/lpfc_nvmet.c @@ -907,7 +907,6 @@ lpfc_nvmet_xmt_ls_rsp(struct nvmet_fc_target_port *tgtport, * before freeing ctxp and iocbq. */ lpfc_in_buf_free(phba, &nvmebuf->dbuf); - ctxp->rqb_buffer = 0; atomic_inc(&nvmep->xmt_ls_rsp); return 0; } |