[PATCH 1/2] ARM: kprobes: Improve robustness for kprobe coverage testing

[Liao Chang]

Improve robustness for kprobe coverage testing, avoid to access NULL
pointer in coverage_start_fn.

Fixes: 963780dfe390 ("ARM: kprobes: Add decoding table test coverage analysis")
Signed-off-by: Liao Chang <liaochang1@xxxxxxxxxx>
---
 arch/arm/probes/kprobes/test-core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/probes/kprobes/test-core.c b/arch/arm/probes/kprobes/test-core.c
index c562832b8627..e6a932e863bb 100644
--- a/arch/arm/probes/kprobes/test-core.c
+++ b/arch/arm/probes/kprobes/test-core.c
@@ -766,6 +766,11 @@ static int coverage_start(const union decode_item *table)
 	coverage.base = kmalloc_array(MAX_COVERAGE_ENTRIES,
 				      sizeof(struct coverage_entry),
 				      GFP_KERNEL);
+	if (!coverage.base) {
+		pr_err("FAIL: Out of space for allocating coverage entries");
+		return -ENOMEM;
+	}
+
 	coverage.num_entries = 0;
 	coverage.nesting = 0;
 	return table_iter(table, coverage_start_fn, &coverage);
-- 
2.17.1