tree: https://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k.git no-dma-compile-testing-v2 head: 2f66c3ff5625a968fe87b2dc0fb74eb8ca31bc40 commit: e1304a3d5b8cd7c476d5e8834482f0056f58b316 [25/26] staging: vc04_services: Remove depends on HAS_DMA in case of platform dependency config: cris-allyesconfig (attached as .config) compiler: cris-linux-gcc (GCC) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout e1304a3d5b8cd7c476d5e8834482f0056f58b316 # save the attached .config to linux build tree make.cross ARCH=cris All warnings (new ones prefixed by >>): drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c: In function 'vchiq_complete_bulk':
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c:610:4: warning: argument 2 null where non-null expected [-Wnonnull]
memcpy((char *)kmap(pages[0]) +
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pagelist->offset,
~~~~~~~~~~~~~~~~~
fragments,
~~~~~~~~~~
head_bytes);
~~~~~~~~~~~
In file included from include/linux/string.h:20:0,
from include/linux/bitmap.h:9,
from include/linux/cpumask.h:12,
from include/linux/interrupt.h:10,
from drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c:37:
arch/cris/include/asm/string.h:8:14: note: in a call to function 'memcpy' declared here
extern void *memcpy(void *, const void *, size_t);
^~~~~~
vim +610 drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
71bad7f08 popcornmix 2013-07-02 574
71bad7f08 popcornmix 2013-07-02 575 static void
4807f2c0e Michael Zoran 2016-11-07 576 free_pagelist(struct vchiq_pagelist_info *pagelistinfo,
4807f2c0e Michael Zoran 2016-11-07 577 int actual)
71bad7f08 popcornmix 2013-07-02 578 {
4807f2c0e Michael Zoran 2016-11-07 579 PAGELIST_T *pagelist = pagelistinfo->pagelist;
4807f2c0e Michael Zoran 2016-11-07 580 struct page **pages = pagelistinfo->pages;
4807f2c0e Michael Zoran 2016-11-07 581 unsigned int num_pages = pagelistinfo->num_pages;
71bad7f08 popcornmix 2013-07-02 582
df044ebfc Greg Kroah-Hartman 2016-10-10 583 vchiq_log_trace(vchiq_arm_log_level, "free_pagelist - %pK, %d",
4807f2c0e Michael Zoran 2016-11-07 584 pagelistinfo->pagelist, actual);
cf9caf192 Michael Zoran 2016-10-25 585
4807f2c0e Michael Zoran 2016-11-07 586 /*
4807f2c0e Michael Zoran 2016-11-07 587 * NOTE: dma_unmap_sg must be called before the
4807f2c0e Michael Zoran 2016-11-07 588 * cpu can touch any of the data/pages.
4807f2c0e Michael Zoran 2016-11-07 589 */
4807f2c0e Michael Zoran 2016-11-07 590 dma_unmap_sg(g_dev, pagelistinfo->scatterlist,
4807f2c0e Michael Zoran 2016-11-07 591 pagelistinfo->num_pages, pagelistinfo->dma_dir);
4807f2c0e Michael Zoran 2016-11-07 592 pagelistinfo->scatterlist_mapped = 0;
71bad7f08 popcornmix 2013-07-02 593
71bad7f08 popcornmix 2013-07-02 594 /* Deal with any partial cache lines (fragments) */
71bad7f08 popcornmix 2013-07-02 595 if (pagelist->type >= PAGELIST_READ_WITH_FRAGMENTS) {
71bad7f08 popcornmix 2013-07-02 596 char *fragments = g_fragments_base +
71bad7f08 popcornmix 2013-07-02 597 (pagelist->type - PAGELIST_READ_WITH_FRAGMENTS) *
71bad7f08 popcornmix 2013-07-02 598 g_fragments_size;
71bad7f08 popcornmix 2013-07-02 599 int head_bytes, tail_bytes;
6e475350a Yamanappagouda Patil 2017-02-21 600
71bad7f08 popcornmix 2013-07-02 601 head_bytes = (g_cache_line_size - pagelist->offset) &
71bad7f08 popcornmix 2013-07-02 602 (g_cache_line_size - 1);
71bad7f08 popcornmix 2013-07-02 603 tail_bytes = (pagelist->offset + actual) &
71bad7f08 popcornmix 2013-07-02 604 (g_cache_line_size - 1);
71bad7f08 popcornmix 2013-07-02 605
71bad7f08 popcornmix 2013-07-02 606 if ((actual >= 0) && (head_bytes != 0)) {
71bad7f08 popcornmix 2013-07-02 607 if (head_bytes > actual)
71bad7f08 popcornmix 2013-07-02 608 head_bytes = actual;
71bad7f08 popcornmix 2013-07-02 609
974d4d03f Stefan Wahren 2017-09-03 @610 memcpy((char *)kmap(pages[0]) +
:::::: The code at line 610 was first introduced by commit
:::::: 974d4d03fc020af4fa4e9e72a86f0fefa37803c5 staging: vchiq_2835_arm: Fix NULL ptr dereference in free_pagelist
:::::: TO: Stefan Wahren <stefan.wahren@xxxxxxxx>
:::::: CC: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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