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b=Z3bsZJLHYCQzwZO54/ElaLeyhDf/2VAfVGWP6UskqGjo6BDeL9kwYAE3utoKcmDQK GHhtYksSfyTl3gjLZWz2dehrtDJp4ROmjUZk2R8KlVYGJwPYVol7nwsFLgYhEZuMTg uekn/PmSjZO6Yj21tF7cR+GCB7vRCkGw55dTjxk3SCd9uvNulE+RuL8V9Lr9yAk5Ia u+CY6ixLAPKnwvYW10VR4dHKaqMtSrxKFUW9xCsE5bauDEMvycJFalKuNLB8eYDizr txwrEJzy9fGaGMhRtEX25lZRDGxQcDOuBgoxkNNZYswROFE8zwxqVSMMwd3E1Ln6b1 I7Jx53ncKsmLw== From: SJ Park To: Cc: SJ Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v1.2 04/12] mm/damon/core: validate number of probes in valid_probe_params() Date: Wed, 29 Jul 2026 07:02:44 -0700 Message-ID: <20260729140253.87753-5-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260729140253.87753-1-sj@kernel.org> References: <20260729140253.87753-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 64C4B20017 X-Rspam-User: X-Stat-Signature: tgbigrenefpo7qn6ffjnqek93ms9r37c X-HE-Tag: 1785333785-423421 X-HE-Meta: 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 JmzLK+0W lJm4wwNFhnZuyckb2ZmjXfNZJIcjoH6GEp6MiImMqBnzxVDrurjKSDowAKHeauEyrvEtj3Y6RyhFz5k6luDUGyxDZF7UXtqlclmIh2otTf/0b7RNtxBWy3dOndqVmvU3X6XWH3qrrsu24XPTrNMx+Xd5iQi8P24CdjOz/RvewluDV26Z4Bc/s3uX1PrLlsJdNFofY52+0JbzkQSPrmqVFNoNG0udt5KipP6i9la/sYwwAWfkO9cR0pJ2Q7nF/CKPW+L3KV676dGmd0fhezSvfFZ9o3g== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Each DAMON context is allowed to have only up to DAMON_MAX_PROBES probes. The central place for validating DAMON probe parameters, damon_valid_probe_params(), is not validating the upper limit, though. Do the validation. Signed-off-by: SJ Park --- mm/damon/core.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/damon/core.c b/mm/damon/core.c index 1b0f12d17de3a..07f4e7126397b 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -1401,6 +1401,13 @@ static bool damon_valid_probe_params(struct damon_ctx *ctx) unsigned char max_probe_hits; struct damon_probe *probe; unsigned int wsum, wsum_to_add; + int nr_probes; + + nr_probes = 0; + damon_for_each_probe(probe, ctx) + nr_probes++; + if (nr_probes > DAMON_MAX_PROBES) + return false; if (!damon_has_probe_weights(ctx)) return true; -- 2.47.3