staging/ipack: Fix bug introduced by IPack device matching

~0 can not be casted to u8.  Instead of using the IPACK_ANY_ID for the format
field we introduce a new IPACK_ANY_FORMAT specifically for that field and
defined as 0xff.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jens Taprogge <jens.taprogge@taprogge.org>
Acked-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 4 insertions, 2 deletions

diff --git a/drivers/staging/ipack/ipack.c b/drivers/staging/ipack/ipack.c
index b3736c0a1086..659aadcac04d 100644
--- a/drivers/staging/ipack/ipack.c
+++ b/drivers/staging/ipack/ipack.c
@@ -31,7 +31,8 @@ static inline const struct ipack_device_id *
 ipack_match_one_device(const struct ipack_device_id *id,
                        const struct ipack_device *device)
 {
-        if ((id->format == IPACK_ANY_ID || id->format == device->id_format) &&
+        if ((id->format == IPACK_ANY_FORMAT ||
+                                id->format == device->id_format) &&
             (id->vendor == IPACK_ANY_ID || id->vendor == device->id_vendor) &&
             (id->device == IPACK_ANY_ID || id->device == device->id_device))
                 return id;
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 999c4c25fbf7..70c6a359b2f4 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -600,6 +600,7 @@ struct x86_cpu_id {
 #define X86_MODEL_ANY  0
 #define X86_FEATURE_ANY 0       /* Same as FPU, you can't test for that */
 
+#define IPACK_ANY_FORMAT 0xff
 #define IPACK_ANY_ID (~0)
 struct ipack_device_id {
         __u8  format;                   /* Format version or IPACK_ANY_ID */
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index 3c22bda8fdf3..df4fc23dd836 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -973,7 +973,7 @@ static int do_ipack_entry(const char *filename,
         id->vendor = TO_NATIVE(id->vendor);
         id->device = TO_NATIVE(id->device);
         strcpy(alias, "ipack:");
-        ADD(alias, "f", id->format != IPACK_ANY_ID, id->format);
+        ADD(alias, "f", id->format != IPACK_ANY_FORMAT, id->format);
         ADD(alias, "v", id->vendor != IPACK_ANY_ID, id->vendor);
         ADD(alias, "d", id->device != IPACK_ANY_ID, id->device);
         add_wildcard(alias);