[SCSI] pm8001: introduce missing kfree

Error handling code following a kmalloc should free the allocated data.

The semantic match that finds the problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression x;
expression E;
identifier f,f1;
position p1,p2;
@@

x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
<... when != x
     when != if (...) { <+...x...+> }
     when != (x) == NULL
     when != (x) != NULL
     when != (x) == 0
     when != (x) != 0
(
x->f1 = E
|
 (x->f1 == NULL || ...)
|
 f(...,x->f1,...)
)
...>
(
 return <+...x...+>;
|
 return@p2 ...;
)

@script:python@
p1 << r.p1;
p2 << r.p2;
@@

print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: jack wang <jack_wang@usish.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 10 insertions, 3 deletions

diff --git a/drivers/scsi/pm8001/pm8001_hwi.c b/drivers/scsi/pm8001/pm8001_hwi.c
index 58d1134935ef..9793aa6afb10 100644
--- a/drivers/scsi/pm8001/pm8001_hwi.c
+++ b/drivers/scsi/pm8001/pm8001_hwi.c
@@ -4199,8 +4199,10 @@ static int pm8001_chip_get_nvmd_req(struct pm8001_hba_info *pm8001_ha,
         circularQ = &pm8001_ha->inbnd_q_tbl[0];
         memset(&nvmd_req, 0, sizeof(nvmd_req));
         rc = pm8001_tag_alloc(pm8001_ha, &tag);
-        if (rc)
+        if (rc) {
+                kfree(fw_control_context);
                 return rc;
+        }
         ccb = &pm8001_ha->ccb_info[tag];
         ccb->ccb_tag = tag;
         ccb->fw_control_context = fw_control_context;
@@ -4276,8 +4278,10 @@ static int pm8001_chip_set_nvmd_req(struct pm8001_hba_info *pm8001_ha,
                 ioctl_payload->length);
         memset(&nvmd_req, 0, sizeof(nvmd_req));
         rc = pm8001_tag_alloc(pm8001_ha, &tag);
-        if (rc)
+        if (rc) {
+                kfree(fw_control_context);
                 return rc;
+        }
         ccb = &pm8001_ha->ccb_info[tag];
         ccb->fw_control_context = fw_control_context;
         ccb->ccb_tag = tag;
@@ -4387,6 +4391,7 @@ pm8001_chip_fw_flash_update_req(struct pm8001_hba_info *pm8001_ha,
                         fw_control->len, 0) != 0) {
                                 PM8001_FAIL_DBG(pm8001_ha,
                                         pm8001_printk("Mem alloc failure\n"));
+                                kfree(fw_control_context);
                                 return -ENOMEM;
                 }
         }
@@ -4401,8 +4406,10 @@ pm8001_chip_fw_flash_update_req(struct pm8001_hba_info *pm8001_ha,
         fw_control_context->virtAddr = buffer;
         fw_control_context->len = fw_control->len;
         rc = pm8001_tag_alloc(pm8001_ha, &tag);
-        if (rc)
+        if (rc) {
+                kfree(fw_control_context);
                 return rc;
+        }
         ccb = &pm8001_ha->ccb_info[tag];
         ccb->fw_control_context = fw_control_context;
         ccb->ccb_tag = tag;