Re: [PATCH] selftests/mm: compaction_test: Fix off by one in check_compaction()

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On 8/9/24 06:32, Dan Carpenter wrote:
The "initial_nr_hugepages" variable is unsigned long so it takes up to
20 characters to print, plus 1 more character for the NUL terminator.
Unfortunately, this buffer is not quite large enough for the terminator
to fit.  Also use snprintf() for a belt and suspenders approach.

Fixes: fb9293b6b015 ("selftests/mm: compaction_test: fix bogus test success and reduce probability of OOM-killer invocation")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
  tools/testing/selftests/mm/compaction_test.c | 5 +++--
  1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/mm/compaction_test.c b/tools/testing/selftests/mm/compaction_test.c
index e140558e6f53..2c3a0eb6b22d 100644
--- a/tools/testing/selftests/mm/compaction_test.c
+++ b/tools/testing/selftests/mm/compaction_test.c
@@ -89,9 +89,10 @@ int check_compaction(unsigned long mem_free, unsigned long hugepage_size,
  	int fd, ret = -1;
  	int compaction_index = 0;
  	char nr_hugepages[20] = {0};
-	char init_nr_hugepages[20] = {0};
+	char init_nr_hugepages[24] = {0};

Can we exceed this limit too? Can you make this a define?

- sprintf(init_nr_hugepages, "%lu", initial_nr_hugepages);
+	snprintf(init_nr_hugepages, sizeof(init_nr_hugepages),
+		 "%lu", initial_nr_hugepages);
/* We want to test with 80% of available memory. Else, OOM killer comes
  	   in to play */

With that change:

Reviewed-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>

thanks,
-- Shuah




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