linux-kernel - Re: [syzbot] Discardable change

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Message-ID: <00000000000006f2f80609cde40a@google.com>
Date:   Fri, 10 Nov 2023 07:22:38 -0800
From:   syzbot <syzbot+7a9bbb158a7a1071eb27@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] Discardable change

For archival purposes, forwarding an incoming command email to
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com.

***

Subject: Discardable change
Author: yuran.pereira@...mail.com

#syz test:
https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux.git master

---
 drivers/usb/core/devio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 3beb6a862e80..22ae7babf46b 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -276,12 +276,14 @@ static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
 		if (remap_pfn_range(vma, vma->vm_start,
 				    virt_to_phys(usbm->mem) >> PAGE_SHIFT,
 				    size, vma->vm_page_prot) < 0) {
+			pr_info("==> if* vma_use_count %d\n", usbm->vma_use_count);
 			dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 			return -EAGAIN;
 		}
 	} else {
 		if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
 				      size)) {
+			pr_info("==> else* vma_use_count %d\n", usbm->vma_use_count);
 			dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 			return -EAGAIN;
 		}
-- 
2.25.1