UBI: add an helper to check lnum validity

ubi_leb_valid() is here to replace the
lnum < 0 || lnum >= vol->reserved_pebs checks.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

3 files changed, 13 insertions, 8 deletions

diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 3490dcd99ad1..45c329694a5e 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -454,7 +454,7 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
 
                 /* Validate the request */
                 err = -EINVAL;
-                if (req.lnum < 0 || req.lnum >= vol->reserved_pebs ||
+                if (!ubi_leb_valid(vol, req.lnum) ||
                     req.bytes < 0 || req.bytes > vol->usable_leb_size)
                         break;
 
@@ -485,7 +485,7 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
                         break;
                 }
 
-                if (lnum < 0 || lnum >= vol->reserved_pebs) {
+                if (!ubi_leb_valid(vol, lnum)) {
                         err = -EINVAL;
                         break;
                 }
diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
index a9e2cef7c95c..cec7f65beb9e 100644
--- a/drivers/mtd/ubi/kapi.c
+++ b/drivers/mtd/ubi/kapi.c
@@ -538,7 +538,7 @@ int ubi_leb_write(struct ubi_volume_desc *desc, int lnum, const void *buf,
         if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
                 return -EROFS;
 
-        if (lnum < 0 || lnum >= vol->reserved_pebs || offset < 0 || len < 0 ||
+        if (!ubi_leb_valid(vol, lnum) || offset < 0 || len < 0 ||
             offset + len > vol->usable_leb_size ||
             offset & (ubi->min_io_size - 1) || len & (ubi->min_io_size - 1))
                 return -EINVAL;
@@ -583,7 +583,7 @@ int ubi_leb_change(struct ubi_volume_desc *desc, int lnum, const void *buf,
         if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
                 return -EROFS;
 
-        if (lnum < 0 || lnum >= vol->reserved_pebs || len < 0 ||
+        if (!ubi_leb_valid(vol, lnum) || len < 0 ||
             len > vol->usable_leb_size || len & (ubi->min_io_size - 1))
                 return -EINVAL;
 
@@ -620,7 +620,7 @@ int ubi_leb_erase(struct ubi_volume_desc *desc, int lnum)
         if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
                 return -EROFS;
 
-        if (lnum < 0 || lnum >= vol->reserved_pebs)
+        if (!ubi_leb_valid(vol, lnum))
                 return -EINVAL;
 
         if (vol->upd_marker)
@@ -680,7 +680,7 @@ int ubi_leb_unmap(struct ubi_volume_desc *desc, int lnum)
         if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
                 return -EROFS;
 
-        if (lnum < 0 || lnum >= vol->reserved_pebs)
+        if (!ubi_leb_valid(vol, lnum))
                 return -EINVAL;
 
         if (vol->upd_marker)
@@ -716,7 +716,7 @@ int ubi_leb_map(struct ubi_volume_desc *desc, int lnum)
         if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
                 return -EROFS;
 
-        if (lnum < 0 || lnum >= vol->reserved_pebs)
+        if (!ubi_leb_valid(vol, lnum))
                 return -EINVAL;
 
         if (vol->upd_marker)
@@ -751,7 +751,7 @@ int ubi_is_mapped(struct ubi_volume_desc *desc, int lnum)
 
         dbg_gen("test LEB %d:%d", vol->vol_id, lnum);
 
-        if (lnum < 0 || lnum >= vol->reserved_pebs)
+        if (!ubi_leb_valid(vol, lnum))
                 return -EINVAL;
 
         if (vol->upd_marker)
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index b51d398f2356..23c902e204aa 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -843,6 +843,11 @@ void ubi_update_reserved(struct ubi_device *ubi);
 void ubi_calculate_reserved(struct ubi_device *ubi);
 int ubi_check_pattern(const void *buf, uint8_t patt, int size);
 
+static inline bool ubi_leb_valid(struct ubi_volume *vol, int lnum)
+{
+        return lnum >= 0 && lnum < vol->reserved_pebs;
+}
+
 /* eba.c */
 int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol,
                       int lnum);