USB: gadget: u_f: Unbreak offset calculation in VLAs

commit bfd08d06d978d0304eb6f7855b548aa2cd1c5486 upstream.

Inadvertently the commit b1cd1b65afba ("USB: gadget: u_f: add overflow checks
to VLA macros") makes VLA macros to always return 0 due to different scope of
two variables of the same name. Obviously we need to have only one.

Fixes: b1cd1b65afba ("USB: gadget: u_f: add overflow checks to VLA macros")
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Brooke Basile <brookebasile@gmail.com>
Cc: stable <stable@kernel.org>
Link: https://lore.kernel.org/r/20200826192119.56450-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/u_f.h b/drivers/usb/gadget/u_f.h
index a0b3e49..d150a67 100644 (file)
--- a/drivers/usb/gadget/u_f.h
+++ b/drivers/usb/gadget/u_f.h
@@ -28,9 +28,9 @@
                size_t offset = 0;                                             \
                if (groupname##__next != SIZE_MAX) {                           \
                        size_t align_mask = __alignof__(type) - 1;             \
-                       size_t offset = (groupname##__next + align_mask)       \
-                                        & ~align_mask;                        \
                        size_t size = array_size(n, sizeof(type));             \
+                       offset = (groupname##__next + align_mask) &            \
+                                 ~align_mask;                                 \
                        if (check_add_overflow(offset, size,                   \
                                               &groupname##__next)) {          \
                                groupname##__next = SIZE_MAX;                  \
@@ -46,8 +46,8 @@
                size_t offset = 0;                                              \
                if (groupname##__next != SIZE_MAX) {                            \
                        size_t align_mask = __alignof__(type) - 1;              \
-                       size_t offset = (groupname##__next + align_mask)        \
-                                        & ~align_mask;                         \
+                       offset = (groupname##__next + align_mask) &             \
+                                 ~align_mask;                                  \
                        if (check_add_overflow(offset, groupname##_##name##__sz,\
                                                        &groupname##__next)) {  \
                                groupname##__next = SIZE_MAX;                   \