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Date:   Fri, 22 Mar 2019 12:12:55 +0100
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,, Dan Carpenter <>,
        Felipe Balbi <>,
        Sasha Levin <>
Subject: [PATCH 4.4 037/230] usb: gadget: Potential NULL dereference on allocation error

4.4-stable review patch.  If anyone has any objections, please let me know.


[ Upstream commit df28169e1538e4a8bcd8b779b043e5aa6524545c ]

The source_sink_alloc_func() function is supposed to return error
pointers on error.  The function is called from usb_get_function() which
doesn't check for NULL returns so it would result in an Oops.

Of course, in the current kernel, small allocations always succeed so
this doesn't affect runtime.

Signed-off-by: Dan Carpenter <>
Signed-off-by: Felipe Balbi <>
Signed-off-by: Sasha Levin <>
 drivers/usb/gadget/function/f_sourcesink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/f_sourcesink.c b/drivers/usb/gadget/function/f_sourcesink.c
index 67b2439899389..d7d095781be18 100644
--- a/drivers/usb/gadget/function/f_sourcesink.c
+++ b/drivers/usb/gadget/function/f_sourcesink.c
@@ -849,7 +849,7 @@ static struct usb_function *source_sink_alloc_func(
 	ss = kzalloc(sizeof(*ss), GFP_KERNEL);
 	if (!ss)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 	ss_opts =  container_of(fi, struct f_ss_opts, func_inst);

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