From: Jeffin Philip <jeffinphilip14@gmail.com>
To: jeffinphilip14@gmail.com
Cc: christophe.jaillet@wanadoo.fr, felipe.balbi@linux.intel.com,
gregkh@linuxfoundation.org, kees@kernel.org,
linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
stable@vger.kernel.org, stern@rowland.harvard.edu,
syzbot+791be35f1fbcc85d06d7@syzkaller.appspotmail.com
Subject: [PATCH] usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers()
Date: Mon, 17 Aug 2026 21:39:16 +0530 [thread overview]
Message-ID: <20260817160916.28523-1-jeffinphilip14@gmail.com> (raw)
In-Reply-To: <20260817160319.28251-1-jeffinphilip14@gmail.com>
On Mon, 17 Aug 2026 21:33:19 +0530, Jeffin Philip wrote:
>Kconfig currently sets the limit from 2 to 256 with default as 2. However,
>we use that only at build time. So, if we enter during runtime via configfs,
>we set page content to 0\0 and get the null pointer dereference. So we will
>need to add the check for num < 2 in fsg_opts_num_buffers_store() and return
>EINVAL? Upper bound is 256 which is below what kstrtou8() can return anyway.
Correction on the last sentence: Upper bound is 256 which is _above_ what
kstrtou8() can return anyway.
next prev parent reply other threads:[~2026-08-17 16:09 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-17 11:08 [PATCH] usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers() Jeffin Philip
2026-08-17 11:10 ` Greg KH
2026-08-17 13:02 ` Jeffin Philip
2026-08-17 13:15 ` Greg KH
2026-08-17 14:01 ` Alan Stern
2026-08-17 16:03 ` Jeffin Philip
2026-08-17 16:09 ` Jeffin Philip [this message]
2026-08-17 16:49 ` Alan Stern
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