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([140.174.219.137]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-894d36c4472sm104931006d6.17.2026.02.01.16.42.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 01 Feb 2026 16:42:27 -0800 (PST) From: Emil Tsalapatis To: sched-ext@lists.linux.dev Cc: tj@kernel.org, void@manifault.com, arighi@nvidia.com, changwoo@igalia.com, Emil Tsalapatis Subject: [PATCH] tools/sched_ext: Fix data header access during free in scx_sdt Date: Sun, 1 Feb 2026 19:42:08 -0500 Message-ID: <20260202004208.42364-1-emil@etsalapatis.com> X-Mailer: git-send-email 2.49.0 Precedence: bulk X-Mailing-List: sched-ext@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Fix a pointer arithmetic error in scx_sdt during freeing that causes the allocator to use the wrong memory address for the allocation's data header. Fixes: f0262b102c7 ("tools/sched_ext: add scx_pair scheduler") Signed-off-by: Emil Tsalapatis --- tools/sched_ext/scx_sdt.bpf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/sched_ext/scx_sdt.bpf.c b/tools/sched_ext/scx_sdt.bpf.c index d965f7d209de..31b09958e8d5 100644 --- a/tools/sched_ext/scx_sdt.bpf.c +++ b/tools/sched_ext/scx_sdt.bpf.c @@ -312,7 +312,7 @@ int scx_alloc_free_idx(struct scx_allocator *alloc, __u64 idx) pos = idx & mask; data = chunk->data[pos]; if (likely(data)) { - data[pos] = (struct sdt_data) { + *data = (struct sdt_data) { .tid.genn = data->tid.genn + 1, }; -- 2.49.0