From f4f689933c63e0fbfba62f2a80efb2b424b139ae Mon Sep 17 00:00:00 2001 From: Yehuda Sadeh Date: Fri, 27 Mar 2009 13:03:51 +0800 Subject: [PATCH] crypto: shash - Fix unaligned calculation with short length 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 Signed-off-by: Herbert Xu --- crypto/shash.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/crypto/shash.c b/crypto/shash.c index 7a659733f94a..2ccc8b0076ce 100644 --- a/crypto/shash.c +++ b/crypto/shash.c @@ -77,6 +77,9 @@ 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) ?: