Messages in this thread Patch in this message | | | From | Randy Dunlap <> | Subject | [PATCH -next] lib: fix test_hmm.c reference after free | Date | Wed, 17 Jun 2020 22:31:21 -0700 |
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From: Randy Dunlap <rdunlap@infradead.org>
Coccinelle scripts report the following errors:
lib/test_hmm.c:523:20-26: ERROR: reference preceded by free on line 521 lib/test_hmm.c:524:21-27: ERROR: reference preceded by free on line 521 lib/test_hmm.c:523:28-35: ERROR: devmem is NULL but dereferenced. lib/test_hmm.c:524:29-36: ERROR: devmem is NULL but dereferenced.
Fix these by using the local variable 'res' instead of devmem.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: Jérôme Glisse <jglisse@redhat.com> Cc: linux-mm@kvack.org Cc: Ralph Campbell <rcampbell@nvidia.com> --- lib/test_hmm.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- linux-next-20200617.orig/lib/test_hmm.c +++ linux-next-20200617/lib/test_hmm.c @@ -520,8 +520,7 @@ static bool dmirror_allocate_chunk(struc err_free: kfree(devmem); err_release: - release_mem_region(devmem->pagemap.res.start, - resource_size(&devmem->pagemap.res)); + release_mem_region(res->start, resource_size(res)); err: mutex_unlock(&mdevice->devmem_lock); return false;
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