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RDMA/core: Use flexible array for mad data

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In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memcpy(), memmove(), and memset(), avoid
intentionally reading across neighboring array fields.

Without a flexible array, this looks like an attempt to perform a memcpy()
read beyond the end of the packet->mad.data array:

drivers/infiniband/core/user_mad.c:
	memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);

Switch from [0] to [] to use the appropriately handled type for trailing
bytes.

Link: https://lore.kernel.org/r/20210616202615.1247242-1-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Kees Cook 2021-06-16 13:26:15 -07:00 committed by Jason Gunthorpe
parent 20ec0a6d60
commit 6d33cabf2b
1 changed files with 1 additions and 1 deletions
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2
include/uapi/rdma/ib_user_mad.h
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@ -143,7 +143,7 @@ struct ib_user_mad_hdr {
*/
struct ib_user_mad {
struct ib_user_mad_hdr hdr;
__aligned_u64 data[0];
__aligned_u64 data[];
};
/*