When the total length is shorter than the calculated number of unaligned bytes, the call to shash->update breaks. For example, calling crc32c on unaligned buffer with length of 1 can result in a system crash.
Signed-off-by: Yehuda Sadeh <[email protected]> --- crypto/shash.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/crypto/shash.c b/crypto/shash.c index d5a2b61..6792a67 100644 --- a/crypto/shash.c +++ b/crypto/shash.c @@ -82,6 +82,9 @@ static int shash_update_unaligned(struct shash_desc *desc, const u8 *data, u8 buf[shash_align_buffer_size(unaligned_len, alignmask)] __attribute__ ((aligned)); + if (unaligned_len > len) + unaligned_len = len; + memcpy(buf, data, unaligned_len); return shash->update(desc, buf, unaligned_len) ?: -- 1.5.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
