According to mass storage specification:
"Logical Unit Numbers on the device shall be numbered contiguously
starting from LUN 0 to a maximum LUN of 15 (Fh)"
So don't allow to bind ms function unless we have at least LUN0
and LUNs ids are contiguous.
Signed-off-by: Krzysztof Opasiak <k.opasiak@xxxxxxxxxxx>
---
drivers/usb/gadget/function/f_mass_storage.c | 29 ++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/drivers/usb/gadget/function/f_mass_storage.c b/drivers/usb/gadget/function/f_mass_storage.c
index 2e8f37e..19b31d7 100644
--- a/drivers/usb/gadget/function/f_mass_storage.c
+++ b/drivers/usb/gadget/function/f_mass_storage.c
@@ -3065,6 +3065,35 @@ static int fsg_bind(struct usb_configuration *c, struct usb_function *f)
int ret;
struct fsg_opts *opts;
+ /*
+ * Don't allow to bind if we don't have at least one LUN
+ * or LUNs ids are not contiguous.
+ */
+ if (likely(common->luns)) {
+ bool found_null = false;
+
+ for (i = 0; i < common->nluns; ++i) {
+ if (!common->luns[i]) {
+ found_null = true;
+ continue;
+ }
+
+ if (!found_null) {
+ continue;
+ } else {
+ pr_err("LUN ids should be contiguous.\n");
+ return -EINVAL;
+ }
+ }
+
+ if (i == 0 || !common->luns[i]) {
+ pr_err("There should be at least one LUN.\n");
+ return -EINVAL;
+ }
+ } else {
+ return -EINVAL;
+ }
+
opts = fsg_opts_from_func_inst(f->fi);
if (!opts->no_configfs) {
ret = fsg_common_set_cdev(fsg->common, c->cdev,
--
1.7.9.5
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