mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

selftests/mm/ksm_functional: prevent unmapping undefined address 

Replace some goto statements with return statements so that unmap() is not
called on an undefined address.  This change is made so that unmap() can
only be reached after mmap() is called (and the address mentioned is
defined).  Returning MAP_FAILED seems acceptable since client code checks
for this value.

Link: https://lkml.kernel.org/r/20240105202401.28851-1-inwardvessel@gmail.com
Fixes: 42096aa24b ("selftest/mm: ksm_functional_tests: test in mmap_and_merge_range() if anything got merged")
Signed-off-by: JP Kobryn <inwardvessel@gmail.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
JP Kobryn 2024-01-05 12:24:01 -08:00 committed by Andrew Morton
parent 6212eb4d7a
commit 3956570ef7
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
tools/testing/selftests/mm/ksm_functional_tests.c
View File

@ -155,12 +155,12 @@ static char *mmap_and_merge_range(char val, unsigned long size, int prot,
/* Stabilize accounting by disabling KSM completely. */
if (ksm_unmerge()) {
ksft_test_result_fail("Disabling (unmerging) KSM failed\n");
goto unmap;
return MAP_FAILED;
}
if (get_my_merging_pages() > 0) {
ksft_test_result_fail("Still pages merged\n");
goto unmap;
return MAP_FAILED;
}
map = mmap(NULL, size, PROT_READ|PROT_WRITE,