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Tue, 22 Sep 2026 05:58:19 -0700 (PDT) Received: from localhost.localdomain ([94.240.182.136]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5b8d46ed384sm461753e87.75.2026.09.22.05.58.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Sep 2026 05:58:18 -0700 (PDT) From: Svyatoslav Nikolenko To: song@kernel.org, yukuai@fygo.io Cc: magiclinan@didiglobal.com, xiao@kernel.org, linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, Svyatoslav Nikolenko , syzbot+270624bb31d478afe62e@syzkaller.appspotmail.com Subject: [PATCH] md/raid5: fix NULL pointer dereference in raid5_has_ppl Date: Tue, 22 Sep 2026 15:54:17 +0300 Message-ID: <20260922125418.2715-1-nsvatoslav515@gmail.com> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Check if conf->mddev is non-NULL in raid5_has_ppl() before testing flags to prevent a KASAN null-ptr-deref during free_conf() cleanup paths. Reported-by: syzbot+270624bb31d478afe62e@syzkaller.appspotmail.com Tested-by: syzbot+270624bb31d478afe62e@syzkaller.appspotmail.com Signed-off-by: Svyatoslav Nikolenko --- drivers/md/raid5-log.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/md/raid5-log.h b/drivers/md/raid5-log.h index c8332502669e..5a144051b142 100644 --- a/drivers/md/raid5-log.h +++ b/drivers/md/raid5-log.h @@ -51,7 +51,7 @@ static inline bool raid5_has_log(struct r5conf *conf) static inline bool raid5_has_ppl(struct r5conf *conf) { - return test_bit(MD_HAS_PPL, &conf->mddev->flags); + return conf->mddev && test_bit(MD_HAS_PPL, &conf->mddev->flags); } static inline int log_stripe(struct stripe_head *sh, struct stripe_head_state *s) -- 2.47.3