+ lib-interval_tree_test-validate-benchmark-parameters.patch added to mm-nonmm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: lib: interval_tree_test: validate benchmark parameters
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     lib-interval_tree_test-validate-benchmark-parameters.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/lib-interval_tree_test-validate-benchmark-parameters.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days

------------------------------------------------------
From: Samuel Moelius <sam.moelius@trailofbits.com>
Subject: lib: interval_tree_test: validate benchmark parameters
Date: Tue, 9 Jun 2026 00:54:47 +0000

The interval tree runtime test accepts module parameters that are later
used as divisors while generating randomized intervals and while reporting
average timings.  For example, max_endpoint=1 makes the generated interval
end value zero and the next modulo operation divides by that zero value.

Reject non-positive counts and require max_endpoint to provide at least
one non-zero generated endpoint before the test allocates state or starts
the benchmark.

Assisted-by: Codex:gpt-5.5-cyber-preview
Signed-off-by: Samuel Moelius <sam.moelius@trailofbits.com>
Link: https://lore.kernel.org/20260609005446.1241288.1525a5964698.interval-tree-test-small-max-endpoint-div0@trailofbits.com
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/interval_tree_test.c |   21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

--- a/lib/interval_tree_test.c~lib-interval_tree_test-validate-benchmark-parameters
+++ a/lib/interval_tree_test.c
@@ -311,6 +311,27 @@ static inline int span_iteration_check(v
 
 static int interval_tree_test_init(void)
 {
+	if (nnodes <= 0) {
+		pr_warn("nnodes must be positive\n");
+		return -EINVAL;
+	}
+	if (nsearches <= 0) {
+		pr_warn("nsearches must be positive\n");
+		return -EINVAL;
+	}
+	if (perf_loops <= 0) {
+		pr_warn("perf_loops must be positive\n");
+		return -EINVAL;
+	}
+	if (search_loops <= 0) {
+		pr_warn("search_loops must be positive\n");
+		return -EINVAL;
+	}
+	if (max_endpoint < 2) {
+		pr_warn("max_endpoint must be at least 2\n");
+		return -EINVAL;
+	}
+
 	nodes = kmalloc_objs(struct interval_tree_node, nnodes);
 	if (!nodes)
 		return -ENOMEM;
_

Patches currently in -mm which might be from sam.moelius@trailofbits.com are

mm-page_frag-reject-invalid-cpus-in-page_frag_test.patch
lib-test_firmware-allocate-the-configured-into_buf-size.patch
lib-interval_tree_test-validate-benchmark-parameters.patch