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| author | Mohamed Ghannam <simo.ghannam@gmail.com> | 2018-01-02 19:44:34 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-17 09:45:21 +0100 |
| commit | 5d127d15ad2f9f33af788f1edf720ba29317f55b (patch) | |
| tree | 778f2e18d3f43a685ded4ea6af19f685d423a929 /net/rds | |
| parent | 5837f963300b63264dd1baf32e96063e807ca28c (diff) | |
| download | linux-stable-5d127d15ad2f9f33af788f1edf720ba29317f55b.tar.gz linux-stable-5d127d15ad2f9f33af788f1edf720ba29317f55b.tar.bz2 linux-stable-5d127d15ad2f9f33af788f1edf720ba29317f55b.zip | |
RDS: Heap OOB write in rds_message_alloc_sgs()
[ Upstream commit c095508770aebf1b9218e77026e48345d719b17c ]
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>
Diffstat (limited to 'net/rds')
| -rw-r--r-- | net/rds/rdma.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/rds/rdma.c b/net/rds/rdma.c index bc2f1e0977d6..94729d9da437 100644 --- a/net/rds/rdma.c +++ b/net/rds/rdma.c @@ -525,6 +525,9 @@ int rds_rdma_extra_size(struct rds_rdma_args *args) local_vec = (struct rds_iovec __user *)(unsigned long) args->local_vec_addr; + if (args->nr_local == 0) + return -EINVAL; + /* figure out the number of pages in the vector */ for (i = 0; i < args->nr_local; i++) { if (copy_from_user(&vec, &local_vec[i], |