From: Arnd Bergmann <arnd@arndb.de>
Date: Fri, 10 Nov 2017 23:10:31 +0100
Subject: RDMA/core: avoid uninitialized variable warning in create_udata
Patch-mainline: v4.15-rc1
Git-commit: cb9fd89f91337aaca9c96d265930f22b31462e5e
References: bsc#1046306 FATE#322942
As Dan pointed out, the rework I did makes it harder for smatch and other
static checkers to figure out what is going on with the uninitialized
pointers.
By open-coding the call in create_udata(), we make it more readable for
both humans and tools.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 12f727721eee ("IB/uverbs: clean up INIT_UDATA_BUF_OR_NULL usage")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/infiniband/core/uverbs_std_types.c | 21 ++++++++++-----------
1 file changed, 10 insertions(+), 11 deletions(-)
--- a/drivers/infiniband/core/uverbs_std_types.c
+++ b/drivers/infiniband/core/uverbs_std_types.c
@@ -227,27 +227,26 @@ static void create_udata(struct uverbs_a
* to use uverbs_attr_bundle instead of ib_udata.
* Assume attr == 0 is input and attr == 1 is output.
*/
- void __user *inbuf;
- size_t inbuf_len = 0;
- void __user *outbuf;
- size_t outbuf_len = 0;
const struct uverbs_attr *uhw_in =
uverbs_attr_get(ctx, UVERBS_UHW_IN);
const struct uverbs_attr *uhw_out =
uverbs_attr_get(ctx, UVERBS_UHW_OUT);
if (!IS_ERR(uhw_in)) {
- inbuf = uhw_in->ptr_attr.ptr;
- inbuf_len = uhw_in->ptr_attr.len;
+ udata->inbuf = uhw_in->ptr_attr.ptr;
+ udata->inlen = uhw_in->ptr_attr.len;
+ } else {
+ udata->inbuf = NULL;
+ udata->inlen = 0;
}
if (!IS_ERR(uhw_out)) {
- outbuf = uhw_out->ptr_attr.ptr;
- outbuf_len = uhw_out->ptr_attr.len;
+ udata->outbuf = uhw_out->ptr_attr.ptr;
+ udata->outlen = uhw_out->ptr_attr.len;
+ } else {
+ udata->outbuf = NULL;
+ udata->outlen = 0;
}
-
- ib_uverbs_init_udata_buf_or_null(udata, inbuf, outbuf, inbuf_len,
- outbuf_len);
}
static int uverbs_create_cq_handler(struct ib_device *ib_dev,