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authorJens Axboe <axboe@fb.com>2014-11-19 13:06:22 -0700
committerJens Axboe <axboe@fb.com>2014-11-19 13:09:07 -0700
commit5fabcb4c33fe11c7e3afdf805fde26c1a54d0953 (patch)
tree7a30365f099b4c180bf8fed77842c0d60b4df8a2 /net
parent7c7f2f2bc9a63f9605a16eabac59fc655dfe7c9a (diff)
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genhd: check for int overflow in disk_expand_part_tbl()
We can get here from blkdev_ioctl() -> blkpg_ioctl() -> add_partition() with a user passed in partno value. If we pass in 0x7fffffff, the new target in disk_expand_part_tbl() overflows the 'int' and we access beyond the end of ptbl->part[] and even write to it when we do the rcu_assign_pointer() to assign the new partition. Reported-by: David Ramos <daramos@stanford.edu> Cc: stable@kernel.org Signed-off-by: Jens Axboe <axboe@fb.com>
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