crypto: sm3 - fix undefined shift by >= width of value

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commit d45a90cb5d upstream.

sm3_compress() calls rol32() with shift >= 32, which causes undefined
behavior.  This is easily detected by enabling CONFIG_UBSAN.

Explicitly AND with 31 to make the behavior well defined.

Fixes: 4f0fc1600e ("crypto: sm3 - add OSCCA SM3 secure hash")
Cc: <stable@vger.kernel.org> # v4.15+
Cc: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Eric Biggers 2019-01-08 22:12:41 -08:00 • committed by Greg Kroah-Hartman

parent 4fa151046f

commit 2661032cca

1 changed files with 1 additions and 1 deletions

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crypto/sm3_generic.c

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