RDS: Heap OOB write in rds_message_alloc_sgs()
[ Upstream commit c095508770
]
When args->nr_local is 0, nr_pages gets also 0 due some size
calculation via rds_rm_size(), which is later used to allocate
pages for DMA, this bug produces a heap Out-Of-Bound write access
to a specific memory region.
Signed-off-by: Mohamed Ghannam <simo.ghannam@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
parent
5837f96330
commit
5d127d15ad
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@ -525,6 +525,9 @@ int rds_rdma_extra_size(struct rds_rdma_args *args)
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local_vec = (struct rds_iovec __user *)(unsigned long) args->local_vec_addr;
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if (args->nr_local == 0)
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return -EINVAL;
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/* figure out the number of pages in the vector */
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for (i = 0; i < args->nr_local; i++) {
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if (copy_from_user(&vec, &local_vec[i],
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