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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2016-09-13 10:48:53 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2016-09-13 12:44:59 +0200
commit2db34e78f126c6001d79d3b66ab1abb482dc7caa (patch)
tree072fdeb208b2b697d729308bbaf1f5851b555188 /scripts/mksysmap
parentcrypto: arm/aes-ctr - fix NULL dereference in tail processing (diff)
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crypto: arm64/aes-ctr - fix NULL dereference in tail processing
The AES-CTR glue code avoids calling into the blkcipher API for the tail portion of the walk, by comparing the remainder of walk.nbytes modulo AES_BLOCK_SIZE with the residual nbytes, and jumping straight into the tail processing block if they are equal. This tail processing block checks whether nbytes != 0, and does nothing otherwise. However, in case of an allocation failure in the blkcipher layer, we may enter this code with walk.nbytes == 0, while nbytes > 0. In this case, we should not dereference the source and destination pointers, since they may be NULL. So instead of checking for nbytes != 0, check for (walk.nbytes % AES_BLOCK_SIZE) != 0, which implies the former in non-error conditions. Fixes: 49788fe2a128 ("arm64/crypto: AES-ECB/CBC/CTR/XTS using ARMv8 NEON and Crypto Extensions") Cc: stable@vger.kernel.org Reported-by: xiakaixu <xiakaixu@huawei.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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