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| author | Mohamed Ghannam <simo.ghannam@gmail.com> | 2018-01-02 20:44:34 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-01-03 17:23:05 +0100 |
| commit | c095508770aebf1b9218e77026e48345d719b17c (patch) | |
| tree | 1f112b635b9bde56a91b6b3de0045f3cbc8ff5ef /net/rds | |
| parent | uapi libc compat: add fallback for unsupported libcs (diff) | |
| download | linux-c095508770aebf1b9218e77026e48345d719b17c.tar.xz linux-c095508770aebf1b9218e77026e48345d719b17c.zip | |
RDS: Heap OOB write in rds_message_alloc_sgs()
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>
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], |