usb: f_fs: Force Reserved1=1 in OS_DESC_EXT_COMPAT

commit a3acc696085e112733d191a77b106e67a4fa110b upstream.

The specification says that the Reserved1 field in OS_DESC_EXT_COMPAT
must have the value "1", but when this feature was first implemented we
rejected any non-zero values.

This was adjusted to accept all non-zero values (while now rejecting
zero) in commit 53642399aa71 ("usb: gadget: f_fs: Fix wrong check on
reserved1 of OS_DESC_EXT_COMPAT"), but that breaks any userspace
programs that worked previously by returning EINVAL when Reserved1 == 0
which was previously the only value that succeeded!

If we just set the field to "1" ourselves, both old and new userspace
programs continue to work correctly and, as a bonus, old programs are
now compliant with the specification without having to fix anything
themselves.

Fixes: 53642399aa71 ("usb: gadget: f_fs: Fix wrong check on reserved1 of OS_DESC_EXT_COMPAT")
Signed-off-by: John Keeping <john@metanate.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index ef8f7d63a8f0a4b1a7927a2de0bc8c4e8029bc65..0202e5132fa78f7344b42041e1e532057e5b0c01 100644 (file)
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -2286,9 +2286,18 @@ static int __ffs_data_do_os_desc(enum ffs_os_desc_type type,
                int i;
 
                if (len < sizeof(*d) ||
-                   d->bFirstInterfaceNumber >= ffs->interfaces_count ||
-                   !d->Reserved1)
+                   d->bFirstInterfaceNumber >= ffs->interfaces_count)
                        return -EINVAL;
+               if (d->Reserved1 != 1) {
+                       /*
+                        * According to the spec, Reserved1 must be set to 1
+                        * but older kernels incorrectly rejected non-zero
+                        * values.  We fix it here to avoid returning EINVAL
+                        * in response to values we used to accept.
+                        */
+                       pr_debug("usb_ext_compat_desc::Reserved1 forced to 1\n");
+                       d->Reserved1 = 1;
+               }
                for (i = 0; i < ARRAY_SIZE(d->Reserved2); ++i)
                        if (d->Reserved2[i])
                                return -EINVAL;