From 3df770725339c41d1cd9be4da4ca0d968119d8ad Mon Sep 17 00:00:00 2001 From: Colin Ian King Date: Wed, 20 Aug 2014 10:19:38 +0100 Subject: [PATCH] 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 Acked-by: Ezequiel Garcia Signed-off-by: Artem Bityutskiy --- drivers/mtd/ubi/block.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c index 33c64955d4d7..518792b7634d 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);