scsi: bnx2fc: Fix error handling in probe()

Commit Message

Dan Carpenter Jan. 24, 2019, 10:29 a.m. UTC

There are two issues here.  First if cmgr->hba is not set early enough
then it leads to a NULL dereference.  Second if we don't completely
initialize cmgr->io_bdt_pool[] then we end up dereferencing
uninitialized pointers.

Fixes: 853e2bd2103a ("[SCSI] bnx2fc: Broadcom FCoE offload driver")
Signed-off-by: Dan Carpenter <[e-mail]>
---
 drivers/scsi/bnx2fc/bnx2fc_io.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Martin K. Petersen Jan. 29, 2019, 6:31 a.m. UTC | #1

Dan,

> There are two issues here.  First if cmgr->hba is not set early enough
> then it leads to a NULL dereference.  Second if we don't completely
> initialize cmgr->io_bdt_pool[] then we end up dereferencing
> uninitialized pointers.

Applied to 5.0/scsi-fixes, thanks!

Patch

diff --git a/drivers/scsi/bnx2fc/bnx2fc_io.c b/drivers/scsi/bnx2fc/bnx2fc_io.c
index 350257c13a5b..bc9f2a2365f4 100644
--- a/drivers/scsi/bnx2fc/bnx2fc_io.c
+++ b/drivers/scsi/bnx2fc/bnx2fc_io.c
@@ -240,6 +240,7 @@  struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
 		return NULL;
 	}
 
+	cmgr->hba = hba;
 	cmgr->free_list = kcalloc(arr_sz, sizeof(*cmgr->free_list),
 				  GFP_KERNEL);
 	if (!cmgr->free_list) {
@@ -256,7 +257,6 @@  struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
 		goto mem_err;
 	}
 
-	cmgr->hba = hba;
 	cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
 
 	for (i = 0; i < arr_sz; i++)  {
@@ -295,7 +295,7 @@  struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
 
 	/* Allocate pool of io_bdts - one for each bnx2fc_cmd */
 	mem_size = num_ios * sizeof(struct io_bdt *);
-	cmgr->io_bdt_pool = kmalloc(mem_size, GFP_KERNEL);
+	cmgr->io_bdt_pool = kzalloc(mem_size, GFP_KERNEL);
 	if (!cmgr->io_bdt_pool) {
 		printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
 		goto mem_err;