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| author | Peng Fan <van.freenix@gmail.com> | 2015-09-11 21:41:47 +0800 |
|---|---|---|
| committer | Brian Norris <computersforpeace@gmail.com> | 2015-09-28 17:23:21 -0700 |
| commit | 2ce401d56b36a7492b26646b94d1fe9194880a1a (patch) | |
| tree | 2ab0c5b5254b72e488c51cba6b0730c2b9b4cef6 /drivers/mtd/mtd_blkdevs.c | |
| parent | 7446076e818814d3237b20a96112b44bdb3f8576 (diff) | |
| download | linux-2ce401d56b36a7492b26646b94d1fe9194880a1a.tar.bz2 | |
mtd: blktrans: fix multiplication overflow
In drivers/mtd/mtd_blkdevs.c:
406 set_capacity(gd, (new->size * tr->blksize) >> 9);
The type of new->size is unsigned long and the type of tr->blksize is int,
the result of 'new->size * tr->blksize' may exceed ULONG_MAX on 32bit
machines.
I use nand chip MT29F32G08CBADBWP which is 4GB and the parameters passed
to kernel is 'mtdparts=gpmi-nand:-(user)', the whole nand chip will be
treated as a 4GB mtd partition. new->size is 0x800000 and tr->blksize is
0x200, 'new->size * tr->blksize' however is 0. This is what we do not want
to see.
Using type cast u64 to fix the multiplication overflow issue.
Signed-off-by: Peng Fan <van.freenix@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd/mtd_blkdevs.c')
| -rw-r--r-- | drivers/mtd/mtd_blkdevs.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c index 44dc965a2f7c..cb47d79f4c21 100644 --- a/drivers/mtd/mtd_blkdevs.c +++ b/drivers/mtd/mtd_blkdevs.c @@ -399,7 +399,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new) snprintf(gd->disk_name, sizeof(gd->disk_name), "%s%d", tr->name, new->devnum); - set_capacity(gd, (new->size * tr->blksize) >> 9); + set_capacity(gd, ((u64)new->size * tr->blksize) >> 9); /* Create the request queue */ spin_lock_init(&new->queue_lock); |