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

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Date:   Thu, 3 Nov 2022 09:16:45 +0800
From:   Liao Chang <liaochang1@...wei.com>
To:     <linux@...linux.org.uk>, <liaochang1@...wei.com>,
        <nico@...xnic.net>, <tixy@...t.co.uk>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] ARM: kprobes: Improve robustness for kprobe coverage testing

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@...wei.com>
---
 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