diff options
| author | Michael Grzeschik <m.grzeschik@pengutronix.de> | 2022-07-07 13:56:12 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-07-08 14:58:25 +0200 |
| commit | 3d0dc539029b09fbd125444c16b11a8ed10b9d0f (patch) | |
| tree | aa1d9621110c19a0010bb1f07acf1c85ccb2e284 /drivers/usb/gadget | |
| parent | 6fb9e1d94789e8ee5a258a23bc588693f743fd6c (diff) | |
| download | linux-3d0dc539029b09fbd125444c16b11a8ed10b9d0f.tar.gz | |
usb: gadget: uvc: fix changing interface name via configfs
When setting the function name, it is always truncated by one char since
snprintf is always including the null-termination in the len parameter.
We use strscpy and fix the size setting to use len + 1 instead.
Fixes: 324e4f85070f ("usb: gadget: uvc: allow changing interface name via configfs")
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Link: https://lore.kernel.org/r/20220707115612.2760569-1-m.grzeschik@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/gadget')
| -rw-r--r-- | drivers/usb/gadget/function/uvc_configfs.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c index e5a6b6e36b3d..4303a3283ba0 100644 --- a/drivers/usb/gadget/function/uvc_configfs.c +++ b/drivers/usb/gadget/function/uvc_configfs.c @@ -2371,6 +2371,7 @@ static ssize_t f_uvc_opts_string_##cname##_store(struct config_item *item,\ const char *page, size_t len) \ { \ struct f_uvc_opts *opts = to_f_uvc_opts(item); \ + int size = min(sizeof(opts->aname), len + 1); \ int ret = 0; \ \ mutex_lock(&opts->lock); \ @@ -2379,8 +2380,9 @@ static ssize_t f_uvc_opts_string_##cname##_store(struct config_item *item,\ goto end; \ } \ \ - ret = snprintf(opts->aname, min(sizeof(opts->aname), len), \ - "%s", page); \ + ret = strscpy(opts->aname, page, size); \ + if (ret == -E2BIG) \ + ret = size - 1; \ \ end: \ mutex_unlock(&opts->lock); \ |