[Qemu-devel] [PATCH 0/1] Fix unaligned reads in the tcg/tci.c

[Anatoly Trosinenko]

The code in tcg/tci.c reads some data from TCI bytecode through
pointer dereferencing. As far as I know unaligned reads in such a way are
undefined behavior and compiling with -fsanitize=undefined enumerated
them as such at run-time.

I have replaced such reads with invocations of ld{l,q}_he_p.
A comment in include/qemu/bswap.h:310 suggests they should be properly
translated by the compiler. I didn't added signed/unsigned casts
since bswap.h does contain separate signed/unsigned versions
for 16-bit integers but does not for 32- and 64-bit ones, so I supposed
the developers of the bswap.h already arranged everything so
integer promotions don't mess things up. I can add casts in case I'm
not right about it.

Anatoly Trosinenko (1):
  tci: eliminate UB due to unaligned reads

 tcg/tci.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

-- 
2.14.1