linux-kernel - [PATCH] usb: gadget: uvc: Fix ERR_PTR dereference in uvc

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Message-Id: <20240802180247.519273-1-abhishektamboli9@gmail.com>
Date: Fri,  2 Aug 2024 23:32:47 +0530
From: Abhishek Tamboli <abhishektamboli9@...il.com>
To: laurent.pinchart@...asonboard.com,
	dan.scally@...asonboard.com
Cc: gregkh@...uxfoundation.org,
	skhan@...uxfoundation.org,
	dan.carpenter@...aro.org,
	rbmarliere@...il.com,
	linux-kernel-mentees@...ts.linuxfoundation.org,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] usb: gadget: uvc: Fix ERR_PTR dereference in uvc_v4l2.c

Fix potential dereferencing of ERR_PTR() in find_format_by_pix()
and uvc_v4l2_enum_format().

Fix the following smatch errors:

drivers/usb/gadget/function/uvc_v4l2.c:124 find_format_by_pix()
error: 'fmtdesc' dereferencing possible ERR_PTR()
drivers/usb/gadget/function/uvc_v4l2.c:392 uvc_v4l2_enum_format()
error: 'fmtdesc' dereferencing possible ERR_PTR()

Signed-off-by: Abhishek Tamboli <abhishektamboli9@...il.com>
---
 drivers/usb/gadget/function/uvc_v4l2.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/gadget/function/uvc_v4l2.c b/drivers/usb/gadget/function/uvc_v4l2.c
index a024aecb76dc..9dd602a742c4 100644
--- a/drivers/usb/gadget/function/uvc_v4l2.c
+++ b/drivers/usb/gadget/function/uvc_v4l2.c
@@ -121,6 +121,9 @@ static struct uvcg_format *find_format_by_pix(struct uvc_device *uvc,
 	list_for_each_entry(format, &uvc->header->formats, entry) {
 		const struct uvc_format_desc *fmtdesc = to_uvc_format(format->fmt);

+		if (IS_ERR(fmtdesc))
+			continue;
+
 		if (fmtdesc->fcc == pixelformat) {
 			uformat = format->fmt;
 			break;
@@ -389,6 +392,9 @@ uvc_v4l2_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
 		return -EINVAL;

 	fmtdesc = to_uvc_format(uformat);
+	if (IS_ERR(fmtdesc))
+		return -EINVAL;
+
 	f->pixelformat = fmtdesc->fcc;

 	return 0;
--
2.34.1