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Fri, 14 Nov 2025 11:01:46 -0800 (PST) Date: Fri, 14 Nov 2025 12:01:44 -0700 From: Mathieu Poirier To: Dawei Li Cc: andersson@kernel.org, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, set_pte_at@outlook.com, Dan Carpenter Subject: Re: [PATCH v3 2/3] rpmsg: char: Fix UAF and memory leak in rpmsg_anonymous_eptdev_create() Message-ID: References: <20251113153909.3789-1-dawei.li@linux.dev> <20251113153909.3789-3-dawei.li@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251113153909.3789-3-dawei.li@linux.dev> On Thu, Nov 13, 2025 at 11:39:08PM +0800, Dawei Li wrote: > Potential UAF and memory leak exsit in exception handling paths for > rpmsg_anonymous_eptdev_create(), fix them. > > - If rpmsg_add_eptdev() failes, eptdev is freed in it. > Subsequent call of dev_err(&eptdev->device) triggers a UAF. > - If __rpmsg_eptdev_open() fails, eptdev is supposed to be freed by > put_device(). > > Fixes: 2410558f5f11 ("rpmsg: char: Implement eptdev based on anonymous inode") > Reported-by: Dan Carpenter > Closes: https://lore.kernel.org/all/aPi6gPZE2_ztOjIW@stanley.mountain/ > Signed-off-by: Dawei Li > --- > drivers/rpmsg/rpmsg_char.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c > index 1b8297b373f0..0919ad0a19df 100644 > --- a/drivers/rpmsg/rpmsg_char.c > +++ b/drivers/rpmsg/rpmsg_char.c > @@ -494,6 +494,7 @@ static int rpmsg_eptdev_add(struct rpmsg_eptdev *eptdev, > if (cdev) > ida_free(&rpmsg_minor_ida, MINOR(dev->devt)); > free_eptdev: > + dev_err(&eptdev->dev, "failed to add %s\n", eptdev->chinfo.name); > kfree(eptdev); > > return ret; > @@ -544,7 +545,6 @@ int rpmsg_anonymous_eptdev_create(struct rpmsg_device *rpdev, struct device *par > > ret = rpmsg_eptdev_add(eptdev, chinfo, false); > if (ret) { > - dev_err(&eptdev->dev, "failed to add %s\n", eptdev->chinfo.name); This doesn't neet to be done if kfree(eptdev) is moved out of rpmsg_eptdev_add(). > return ret; > } > > @@ -560,6 +560,8 @@ int rpmsg_anonymous_eptdev_create(struct rpmsg_device *rpdev, struct device *par > > if (!ret) > *pfd = fd; > + else > + put_device(&eptdev->dev); This goes in the previous patch. > > return ret; > } > -- > 2.25.1 >