Message ID | 20211019155309.65576-2-andrea.righi@canonical.com |
---|---|
State | New |
Headers | show
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Tue, 19 Oct 2021 08:53:14 -0700 (PDT) Received: from arighi-desktop.homenet.telecomitalia.it ([2001:67c:1560:8007::aac:c1b6]) by smtp.gmail.com with ESMTPSA id bq4sm10463682ejb.43.2021.10.19.08.53.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Oct 2021 08:53:14 -0700 (PDT) From: Andrea Righi <andrea.righi@canonical.com> To: kernel-team@lists.ubuntu.com Subject: [SRU][I][PATCH 1/1] blk-wbt: prevent NULL pointer dereference in wb_timer_fn Date: Tue, 19 Oct 2021 17:53:09 +0200 Message-Id: <20211019155309.65576-2-andrea.righi@canonical.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211019155309.65576-1-andrea.righi@canonical.com> References: <20211019155309.65576-1-andrea.righi@canonical.com> MIME-Version: 1.0 X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.20 Precedence: list List-Id: Kernel team discussions <kernel-team.lists.ubuntu.com> List-Unsubscribe: <https://lists.ubuntu.com/mailman/options/kernel-team>, <mailto:kernel-team-request@lists.ubuntu.com?subject=unsubscribe> List-Archive: <https://lists.ubuntu.com/archives/kernel-team> List-Post: <mailto:kernel-team@lists.ubuntu.com> List-Help: <mailto:kernel-team-request@lists.ubuntu.com?subject=help> List-Subscribe: <https://lists.ubuntu.com/mailman/listinfo/kernel-team>, <mailto:kernel-team-request@lists.ubuntu.com?subject=subscribe> Content-Type: text/plain; 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Series |
kernel panic: NULL pointer dereference in wb_timer_f()
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diff --git a/block/blk-wbt.c b/block/blk-wbt.c index f5e5ac915bf7..cb7bfeb8a35e 100644 --- a/block/blk-wbt.c +++ b/block/blk-wbt.c @@ -357,6 +357,9 @@ static void wb_timer_fn(struct blk_stat_callback *cb) unsigned int inflight = wbt_inflight(rwb); int status; + if (!rwb->rqos.q->disk) + return; + status = latency_exceeded(rwb, cb->stat); trace_wbt_timer(rwb->rqos.q->backing_dev_info, status, rqd->scale_step,