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rbd: rework rbd_img_obj_exists_submit() error paths 

- don't put obj_request before rbd_obj_request_get() if
  rbd_obj_request_create() fails
- don't leak pages if rbd_obj_request_create() fails
- don't leak stat_request if rbd_osd_req_create() fails

Reported-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: David Disseldorp <ddiss@suse.de>
This commit is contained in:
Ilya Dryomov 2016-09-15 17:53:32 +02:00
parent fa355112c2
commit 710214e391
1 changed files with 22 additions and 20 deletions
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42
drivers/block/rbd.c
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@ -2894,11 +2894,23 @@ static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request)
{
struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev;
struct rbd_obj_request *stat_request;
struct page **pages = NULL;
struct page **pages;
u32 page_count;
size_t size;
int ret;
stat_request = rbd_obj_request_create(obj_request->object_name, 0, 0,
OBJ_REQUEST_PAGES);
if (!stat_request)
return -ENOMEM;
stat_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1,
stat_request);
if (!stat_request->osd_req) {
ret = -ENOMEM;
goto fail_stat_request;
}
/*
* The response data for a STAT call consists of:
* le64 length;
@ -2910,38 +2922,28 @@ static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request)
size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32);
page_count = (u32)calc_pages_for(0, size);
pages = ceph_alloc_page_vector(page_count, GFP_KERNEL);
if (IS_ERR(pages))
return PTR_ERR(pages);
if (IS_ERR(pages)) {
ret = PTR_ERR(pages);
goto fail_stat_request;
}
ret = -ENOMEM;
stat_request = rbd_obj_request_create(obj_request->object_name, 0, 0,
OBJ_REQUEST_PAGES);
if (!stat_request)
goto out;
osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT, 0);
osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0,
false, false);
rbd_obj_request_get(obj_request);
stat_request->obj_request = obj_request;
stat_request->pages = pages;
stat_request->page_count = page_count;
stat_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1,
stat_request);
if (!stat_request->osd_req)
goto out;
stat_request->callback = rbd_img_obj_exists_callback;
osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT, 0);
osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0,
false, false);
rbd_osd_req_format_read(stat_request);
rbd_obj_request_submit(stat_request);
return 0;
out:
if (ret)
rbd_obj_request_put(obj_request);
fail_stat_request:
rbd_obj_request_put(stat_request);
return ret;
}