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SubjectRe: [PATCH] infiniband: avoid overflow warning
On Mon, 2017-07-31 at 08:50 +0200, Arnd Bergmann wrote:
> A sockaddr_in structure on the stack getting passed into rdma_ip2gid
> triggers this warning, since we memcpy into a larger sockaddr_in6
> structure:
> In function 'memcpy',
> inlined from 'rdma_ip2gid' at include/rdma/ib_addr.h:175:3,
> inlined from 'addr_event.isra.4.constprop' at
> drivers/infiniband/core/roce_gid_mgmt.c:693:2,
> inlined from 'inetaddr_event' at
> drivers/infiniband/core/roce_gid_mgmt.c:716:9:
> include/linux/string.h:305:4: error: call to '__read_overflow2'
> declared with attribute error: detected read beyond size of object
> passed as 2nd parameter
> The warning seems appropriate here, but the code is also clearly
> correct, so we really just want to shut up this instance of the
> output.
> The best way I found so far is to avoid the memcpy() call and instead
> replace it with a struct assignment.
> Fixes: 6974f0c4555e ("include/linux/string.h: add the option of
> fortified string.h functions")
> Cc: Daniel Micay <>
> Cc: Kees Cook <>
> Signed-off-by: Arnd Bergmann <>

Thanks, applied.

Doug Ledford <>
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