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scsi: qedf: Add additional checks for io_req->sc_cmd validity

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- Check the validity of various pointers before processing.

Signed-off-by: Chad Dupuis <cdupuis@marvell.com>
Signed-off-by: Saurav Kashyap <skashyap@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Chad Dupuis 2019-03-26 00:38:46 -07:00 committed by Martin K. Petersen
parent 78a8ab3cc0
commit 627cc7dd73
1 changed files with 37 additions and 2 deletions
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39
drivers/scsi/qedf/qedf_io.c
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@ -1324,7 +1324,7 @@ void qedf_scsi_done(struct qedf_ctx *qedf, struct qedf_ioreq *io_req,
if (!virt_addr_valid(sc_cmd)) {
QEDF_ERR(&qedf->dbg_ctx, "sc_cmd=%p is not valid.", sc_cmd);
return;
goto bad_scsi_ptr;
}
if (!sc_cmd->SCp.ptr) {
@ -1336,7 +1336,34 @@ void qedf_scsi_done(struct qedf_ctx *qedf, struct qedf_ioreq *io_req,
if (!sc_cmd->device) {
QEDF_ERR(&qedf->dbg_ctx, "Device for sc_cmd %p is NULL.\n",
sc_cmd);
return;
goto bad_scsi_ptr;
}
if (!virt_addr_valid(sc_cmd->device)) {
QEDF_ERR(&qedf->dbg_ctx,
"Device pointer for sc_cmd %p is bad.\n", sc_cmd);
goto bad_scsi_ptr;
}
if (!sc_cmd->sense_buffer) {
QEDF_ERR(&qedf->dbg_ctx,
"sc_cmd->sense_buffer for sc_cmd %p is NULL.\n",
sc_cmd);
goto bad_scsi_ptr;
}
if (!virt_addr_valid(sc_cmd->sense_buffer)) {
QEDF_ERR(&qedf->dbg_ctx,
"sc_cmd->sense_buffer for sc_cmd %p is bad.\n",
sc_cmd);
goto bad_scsi_ptr;
}
if (!sc_cmd->scsi_done) {
QEDF_ERR(&qedf->dbg_ctx,
"sc_cmd->scsi_done for sc_cmd %p is NULL.\n",
sc_cmd);
goto bad_scsi_ptr;
}
qedf_unmap_sg_list(qedf, io_req);
@ -1365,6 +1392,14 @@ void qedf_scsi_done(struct qedf_ctx *qedf, struct qedf_ioreq *io_req,
sc_cmd->SCp.ptr = NULL;
sc_cmd->scsi_done(sc_cmd);
kref_put(&io_req->refcount, qedf_release_cmd);
bad_scsi_ptr:
/*
* Clear the io_req->sc_cmd backpointer so we don't try to process
* this again
*/
io_req->sc_cmd = NULL;
kref_put(&io_req->refcount, qedf_release_cmd); /* ID: 001 */
}
/*