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Message-ID: <20240708142553.3995022-1-jkeeping@inmusicbrands.com> Date: Mon, 8 Jul 2024 15:25:53 +0100 From: John Keeping <jkeeping@...usicbrands.com> To: linux-usb@...r.kernel.org Cc: John Keeping <jkeeping@...usicbrands.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, linux-kernel@...r.kernel.org Subject: [PATCH] usb: gadget: f_uac2: fix non-newline-terminated function name Most writes to configfs handle an optional newline, but do not require it. By using the number of bytes written as the limit for scnprintf() it is guaranteed that the final character in the buffer will be overwritten. This is expected if it is a newline but is undesirable when a string is written "as-is" (as libusbgx does, for example). Update the store function to strip an optional newline, matching the behaviour of usb_string_copy(). Signed-off-by: John Keeping <jkeeping@...usicbrands.com> --- drivers/usb/gadget/function/f_uac2.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c index f85ffa24a5cd5..2d6d3286ffde2 100644 --- a/drivers/usb/gadget/function/f_uac2.c +++ b/drivers/usb/gadget/function/f_uac2.c @@ -2063,7 +2063,10 @@ static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \ goto end; \ } \ \ - ret = scnprintf(opts->name, min(sizeof(opts->name), len), \ + if (len && page[len - 1] == '\n') \ + len--; \ + \ + ret = scnprintf(opts->name, min(sizeof(opts->name), len + 1), \ "%s", page); \ \ end: \ -- 2.45.2
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