Revision dec24b3b339487e58ce2da2875e9ee0316cc7e70 authored by Kees Cook on 20 June 2023, 19:42:38 UTC, committed by Paolo Abeni on 22 June 2023, 09:27:47 UTC
struct mux_adth actually ends with multiple struct mux_adth_dg members. This is seen both in the comments about the member: /** * struct mux_adth - Structure of the Aggregated Datagram Table Header. ... * @dg: datagramm table with variable length */ and in the preparation for populating it: adth_dg_size = offsetof(struct mux_adth, dg) + ul_adb->dg_count[i] * sizeof(*dg); ... adth_dg_size -= offsetof(struct mux_adth, dg); memcpy(&adth->dg, ul_adb->dg[i], adth_dg_size); This was reported as a run-time false positive warning: memcpy: detected field-spanning write (size 16) of single field "&adth->dg" at drivers/net/wwan/iosm/iosm_ipc_mux_codec.c:852 (size 8) Adjust the struct mux_adth definition and associated sizeof() math; no binary output differences are observed in the resulting object file. Reported-by: Florian Klink <flokli@flokli.de> Closes: https://lore.kernel.org/lkml/dbfa25f5-64c8-5574-4f5d-0151ba95d232@gmail.com/ Fixes: 1f52d7b62285 ("net: wwan: iosm: Enable M.2 7360 WWAN card support") Cc: M Chetan Kumar <m.chetan.kumar@intel.com> Cc: Bagas Sanjaya <bagasdotme@gmail.com> Cc: Intel Corporation <linuxwwan@intel.com> Cc: Loic Poulain <loic.poulain@linaro.org> Cc: Sergey Ryazanov <ryazanov.s.a@gmail.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <edumazet@google.com> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Paolo Abeni <pabeni@redhat.com> Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org> Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Reviewed-by: Simon Horman <simon.horman@corigine.com> Link: https://lore.kernel.org/r/20230620194234.never.023-kees@kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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resource.c
// SPDX-License-Identifier: GPL-2.0
/*
* KUnit resource API for test managed resources (allocations, etc.).
*
* Copyright (C) 2022, Google LLC.
* Author: Daniel Latypov <dlatypov@google.com>
*/
#include <kunit/resource.h>
#include <kunit/test.h>
#include <linux/kref.h>
/*
* Used for static resources and when a kunit_resource * has been created by
* kunit_alloc_resource(). When an init function is supplied, @data is passed
* into the init function; otherwise, we simply set the resource data field to
* the data value passed in. Doesn't initialize res->should_kfree.
*/
int __kunit_add_resource(struct kunit *test,
kunit_resource_init_t init,
kunit_resource_free_t free,
struct kunit_resource *res,
void *data)
{
int ret = 0;
unsigned long flags;
res->free = free;
kref_init(&res->refcount);
if (init) {
ret = init(res, data);
if (ret)
return ret;
} else {
res->data = data;
}
spin_lock_irqsave(&test->lock, flags);
list_add_tail(&res->node, &test->resources);
/* refcount for list is established by kref_init() */
spin_unlock_irqrestore(&test->lock, flags);
return ret;
}
EXPORT_SYMBOL_GPL(__kunit_add_resource);
void kunit_remove_resource(struct kunit *test, struct kunit_resource *res)
{
unsigned long flags;
bool was_linked;
spin_lock_irqsave(&test->lock, flags);
was_linked = !list_empty(&res->node);
list_del_init(&res->node);
spin_unlock_irqrestore(&test->lock, flags);
if (was_linked)
kunit_put_resource(res);
}
EXPORT_SYMBOL_GPL(kunit_remove_resource);
int kunit_destroy_resource(struct kunit *test, kunit_resource_match_t match,
void *match_data)
{
struct kunit_resource *res = kunit_find_resource(test, match,
match_data);
if (!res)
return -ENOENT;
kunit_remove_resource(test, res);
/* We have a reference also via _find(); drop it. */
kunit_put_resource(res);
return 0;
}
EXPORT_SYMBOL_GPL(kunit_destroy_resource);
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