FAILED: patch "[PATCH] usb: gadget: u_audio: Check return codes from usb_ep_enable" failed to apply to 5.15-stable tree

FAILED: patch "[PATCH] usb: gadget: u_audio: Check return codes from usb_ep_enable" failed to apply to 5.15-stable tree

[gregkh]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 76a7bfc445b8e9893c091e24ccfd4f51dfdc0a70
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024081259-emporium-sequence-80c6@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

76a7bfc445b8 ("usb: gadget: u_audio: Check return codes from usb_ep_enable and config_ep_by_speed.")
8722a949e62a ("usb: gadget: u_audio: Move dynamic srate from params to rtd")
c565ad07ef35 ("usb: gadget: u_audio: Support multiple sampling rates")
f2f69bf65df1 ("usb: gadget: u_audio: fix calculations for small bInterval")
6fec018a7e70 ("usb: gadget: u_audio.c: Adding Playback Pitch ctl for sync playback")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 76a7bfc445b8e9893c091e24ccfd4f51dfdc0a70 Mon Sep 17 00:00:00 2001
From: Chris Wulff <crwulff@gmail.com>
Date: Sun, 21 Jul 2024 15:23:15 -0400
Subject: [PATCH] usb: gadget: u_audio: Check return codes from usb_ep_enable
 and config_ep_by_speed.

These functions can fail if descriptors are malformed, or missing,
for the selected USB speed.

Fixes: eb9fecb9e69b ("usb: gadget: f_uac2: split out audio core")
Fixes: 24f779dac8f3 ("usb: gadget: f_uac2/u_audio: add feedback endpoint support")
Cc: stable@vger.kernel.org
Signed-off-by: Chris Wulff <crwulff@gmail.com>
Link: https://lore.kernel.org/r/20240721192314.3532697-2-crwulff@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/function/u_audio.c b/drivers/usb/gadget/function/u_audio.c
index 89af0feb7512..24299576972f 100644
--- a/drivers/usb/gadget/function/u_audio.c
+++ b/drivers/usb/gadget/function/u_audio.c
@@ -592,16 +592,25 @@ int u_audio_start_capture(struct g_audio *audio_dev)
 	struct usb_ep *ep, *ep_fback;
 	struct uac_rtd_params *prm;
 	struct uac_params *params = &audio_dev->params;
-	int req_len, i;
+	int req_len, i, ret;
 
 	prm = &uac->c_prm;
 	dev_dbg(dev, "start capture with rate %d\n", prm->srate);
 	ep = audio_dev->out_ep;
-	config_ep_by_speed(gadget, &audio_dev->func, ep);
+	ret = config_ep_by_speed(gadget, &audio_dev->func, ep);
+	if (ret < 0) {
+		dev_err(dev, "config_ep_by_speed for out_ep failed (%d)\n", ret);
+		return ret;
+	}
+
 	req_len = ep->maxpacket;
 
 	prm->ep_enabled = true;
-	usb_ep_enable(ep);
+	ret = usb_ep_enable(ep);
+	if (ret < 0) {
+		dev_err(dev, "usb_ep_enable failed for out_ep (%d)\n", ret);
+		return ret;
+	}
 
 	for (i = 0; i < params->req_number; i++) {
 		if (!prm->reqs[i]) {
@@ -629,9 +638,18 @@ int u_audio_start_capture(struct g_audio *audio_dev)
 		return 0;
 
 	/* Setup feedback endpoint */
-	config_ep_by_speed(gadget, &audio_dev->func, ep_fback);
+	ret = config_ep_by_speed(gadget, &audio_dev->func, ep_fback);
+	if (ret < 0) {
+		dev_err(dev, "config_ep_by_speed in_ep_fback failed (%d)\n", ret);
+		return ret; // TODO: Clean up out_ep
+	}
+
 	prm->fb_ep_enabled = true;
-	usb_ep_enable(ep_fback);
+	ret = usb_ep_enable(ep_fback);
+	if (ret < 0) {
+		dev_err(dev, "usb_ep_enable failed for in_ep_fback (%d)\n", ret);
+		return ret; // TODO: Clean up out_ep
+	}
 	req_len = ep_fback->maxpacket;
 
 	req_fback = usb_ep_alloc_request(ep_fback, GFP_ATOMIC);
@@ -687,13 +705,17 @@ int u_audio_start_playback(struct g_audio *audio_dev)
 	struct uac_params *params = &audio_dev->params;
 	unsigned int factor;
 	const struct usb_endpoint_descriptor *ep_desc;
-	int req_len, i;
+	int req_len, i, ret;
 	unsigned int p_pktsize;
 
 	prm = &uac->p_prm;
 	dev_dbg(dev, "start playback with rate %d\n", prm->srate);
 	ep = audio_dev->in_ep;
-	config_ep_by_speed(gadget, &audio_dev->func, ep);
+	ret = config_ep_by_speed(gadget, &audio_dev->func, ep);
+	if (ret < 0) {
+		dev_err(dev, "config_ep_by_speed for in_ep failed (%d)\n", ret);
+		return ret;
+	}
 
 	ep_desc = ep->desc;
 	/*
@@ -720,7 +742,11 @@ int u_audio_start_playback(struct g_audio *audio_dev)
 	uac->p_residue_mil = 0;
 
 	prm->ep_enabled = true;
-	usb_ep_enable(ep);
+	ret = usb_ep_enable(ep);
+	if (ret < 0) {
+		dev_err(dev, "usb_ep_enable failed for in_ep (%d)\n", ret);
+		return ret;
+	}
 
 	for (i = 0; i < params->req_number; i++) {
 		if (!prm->reqs[i]) {