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[92.242.249.15]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4999610ddaesm75681475e9.7.2026.08.16.08.39.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 16 Aug 2026 08:39:17 -0700 (PDT) From: Jakov Novak To: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kernel-mentees@lists.linux.dev, Ulf Hansson Cc: Johan Hovold , Guangshuo Li , Runyu Xiao , Shuah Khan , Jakov Novak , syzbot+1ee4f3b9228e35f14677@syzkaller.appspotmail.com Subject: [PATCH] mmc: vub300: fix sleeping function call from invalid context in vub300_inactivity_timer_expired Date: Sun, 16 Aug 2026 17:38:09 +0200 Message-ID: <20260816153809.7067-1-jakovnovak30@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel-mentees@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Currently, the function vub300_inactivity_timer_expired, which gets called in a softirq context, calls a sleeping function in the following call chain: vub300_inactivity_timer_expired -> kref_put -> vub300_delete -> mmc_free_host -> cancel_delayed_work_sync -> __cancel_work_sync -> might_sleep -> BUG Fix this by replacing kref_put(&vub300->kref, vub300_delete) with vub300_queue_dead_work(vub300), which does the same thing, but in a workqueue context. Fixes: 88095e7b473a ("mmc: Add new VUB300 USB-to-SD/SDIO/MMC driver") Reported-and-tested-by: syzbot+1ee4f3b9228e35f14677@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=1ee4f3b9228e35f14677 Signed-off-by: Jakov Novak --- drivers/mmc/host/vub300.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mmc/host/vub300.c b/drivers/mmc/host/vub300.c index 2dae474dcd06..df0096bc53db 100644 --- a/drivers/mmc/host/vub300.c +++ b/drivers/mmc/host/vub300.c @@ -744,7 +744,7 @@ static void vub300_inactivity_timer_expired(struct timer_list *t) struct vub300_mmc_host *vub300 = timer_container_of(vub300, t, inactivity_timer); if (!vub300->interface) { - kref_put(&vub300->kref, vub300_delete); + vub300_queue_dead_work(vub300); } else if (vub300->cmd) { mod_timer(&vub300->inactivity_timer, jiffies + HZ); } else { -- 2.55.0