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| author | Colin Ian King <colin.king@canonical.com> | 2014-08-20 10:19:38 +0100 |
|---|---|---|
| committer | Artem Bityutskiy <artem.bityutskiy@linux.intel.com> | 2014-09-16 19:02:04 +0300 |
| commit | 3df770725339c41d1cd9be4da4ca0d968119d8ad (patch) | |
| tree | 75ea40d96de8dce7450bbd306c22f6350c1e5edf /drivers/mtd/ubi | |
| parent | 1bf1890e86869032099b539bc83b098be12fc5a7 (diff) | |
| download | op-kernel-dev-3df770725339c41d1cd9be4da4ca0d968119d8ad.zip op-kernel-dev-3df770725339c41d1cd9be4da4ca0d968119d8ad.tar.gz | |
UBI: block: fix dereference on uninitialized dev
commit 4df38926f337 ("UBI: block: Avoid disk size integer overflow")
introduced a dereference on dev (which is not initialized at that
point) when printing a warning message. Re-order disk_capacity check
after the dev is found.
Found by cppcheck:
[drivers/mtd/ubi/block.c:509]: (error) Uninitialized variable: dev
Artem: tweak the error message a bit
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Diffstat (limited to 'drivers/mtd/ubi')
| -rw-r--r-- | drivers/mtd/ubi/block.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c index 33c6495..518792b 100644 --- a/drivers/mtd/ubi/block.c +++ b/drivers/mtd/ubi/block.c @@ -504,11 +504,6 @@ static int ubiblock_resize(struct ubi_volume_info *vi) struct ubiblock *dev; u64 disk_capacity = ((u64)vi->size * vi->usable_leb_size) >> 9; - if ((sector_t)disk_capacity != disk_capacity) { - ubi_warn("%s: the volume is too big, cannot resize (%d LEBs)", - dev->gd->disk_name, vi->size); - return -EFBIG; - } /* * Need to lock the device list until we stop using the device, * otherwise the device struct might get released in @@ -520,6 +515,12 @@ static int ubiblock_resize(struct ubi_volume_info *vi) mutex_unlock(&devices_mutex); return -ENODEV; } + if ((sector_t)disk_capacity != disk_capacity) { + mutex_unlock(&devices_mutex); + ubi_warn("%s: the volume is too big (%d LEBs), cannot resize", + dev->gd->disk_name, vi->size); + return -EFBIG; + } mutex_lock(&dev->dev_mutex); set_capacity(dev->gd, disk_capacity); |
