[PATCH 12/60] staging: lustre: lmv: Error not handled for lmv_find_target

From: James Simmons
Date: Sat Jan 28 2017 - 19:10:27 EST


From: Ulka Vaze <ulka.vaze@xxxxxxxx>

This issue is found by smatch; has been reported as-
Unchecked usage of potential ERR_PTR result in lmv_hsm_req_count
and lmv_hsm_req_build. Added ERR_PTR in both functions and also
return value check added.

Signed-off-by: Ulka Vaze <ulka.vaze@xxxxxxxx>
Signed-off-by: Aditya Pandit <panditadityashreesh@xxxxxxxxx>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6523
Reviewed-on: http://review.whamcloud.com/14918
Reviewed-by: Dmitry Eremin <dmitry.eremin@xxxxxxxxx>
Reviewed-by: Andreas Dilger <andreas.dilger@xxxxxxxxx>
Reviewed-by: Oleg Drokin <oleg.drokin@xxxxxxxxx>
Signed-off-by: James Simmons <jsimmons@xxxxxxxxxxxxx>
---
drivers/staging/lustre/lustre/lmv/lmv_obd.c | 25 ++++++++++++++++++-------
1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/lustre/lustre/lmv/lmv_obd.c b/drivers/staging/lustre/lustre/lmv/lmv_obd.c
index 6a3b83f..915415c 100644
--- a/drivers/staging/lustre/lustre/lmv/lmv_obd.c
+++ b/drivers/staging/lustre/lustre/lmv/lmv_obd.c
@@ -736,16 +736,18 @@ static int lmv_hsm_req_count(struct lmv_obd *lmv,
/* count how many requests must be sent to the given target */
for (i = 0; i < hur->hur_request.hr_itemcount; i++) {
curr_tgt = lmv_find_target(lmv, &hur->hur_user_item[i].hui_fid);
+ if (IS_ERR(curr_tgt))
+ return PTR_ERR(curr_tgt);
if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid))
nr++;
}
return nr;
}

-static void lmv_hsm_req_build(struct lmv_obd *lmv,
- struct hsm_user_request *hur_in,
- const struct lmv_tgt_desc *tgt_mds,
- struct hsm_user_request *hur_out)
+static int lmv_hsm_req_build(struct lmv_obd *lmv,
+ struct hsm_user_request *hur_in,
+ const struct lmv_tgt_desc *tgt_mds,
+ struct hsm_user_request *hur_out)
{
int i, nr_out;
struct lmv_tgt_desc *curr_tgt;
@@ -756,6 +758,8 @@ static void lmv_hsm_req_build(struct lmv_obd *lmv,
for (i = 0; i < hur_in->hur_request.hr_itemcount; i++) {
curr_tgt = lmv_find_target(lmv,
&hur_in->hur_user_item[i].hui_fid);
+ if (IS_ERR(curr_tgt))
+ return PTR_ERR(curr_tgt);
if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid)) {
hur_out->hur_user_item[nr_out] =
hur_in->hur_user_item[i];
@@ -765,6 +769,8 @@ static void lmv_hsm_req_build(struct lmv_obd *lmv,
hur_out->hur_request.hr_itemcount = nr_out;
memcpy(hur_data(hur_out), hur_data(hur_in),
hur_in->hur_request.hr_data_len);
+
+ return 0;
}

static int lmv_hsm_ct_unregister(struct lmv_obd *lmv, unsigned int cmd, int len,
@@ -1041,15 +1047,17 @@ static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
} else {
/* split fid list to their respective MDS */
for (i = 0; i < count; i++) {
- unsigned int nr, reqlen;
- int rc1;
struct hsm_user_request *req;
+ size_t reqlen;
+ int nr, rc1;

tgt = lmv->tgts[i];
if (!tgt || !tgt->ltd_exp)
continue;

nr = lmv_hsm_req_count(lmv, hur, tgt);
+ if (nr < 0)
+ return nr;
if (nr == 0) /* nothing for this MDS */
continue;

@@ -1061,10 +1069,13 @@ static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
if (!req)
return -ENOMEM;

- lmv_hsm_req_build(lmv, hur, tgt, req);
+ rc1 = lmv_hsm_req_build(lmv, hur, tgt, req);
+ if (rc1 < 0)
+ goto hsm_req_err;

rc1 = obd_iocontrol(cmd, tgt->ltd_exp, reqlen,
req, uarg);
+hsm_req_err:
if (rc1 != 0 && rc == 0)
rc = rc1;
kvfree(req);
--
1.8.3.1