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RDMA/core: avoid uninitialized variable warning in create_udata

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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: 12f727721e ("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>
This commit is contained in:
Arnd Bergmann 2017-11-10 23:10:31 +01:00 committed by Doug Ledford
parent 051276658b
commit cb9fd89f91
1 changed files with 10 additions and 11 deletions
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21
drivers/infiniband/core/uverbs_std_types.c
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@ -227,27 +227,26 @@ static void create_udata(struct uverbs_attr_bundle *ctx,
* 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,