From: Yehuda Sadeh Date: Fri, 27 Mar 2009 05:03:51 +0000 (+0800) Subject: crypto: shash - Fix unaligned calculation with short length X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=f4f689933c63e0fbfba62f2a80efb2b424b139ae;p=linux-2.6-omap-h63xx.git 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 --- diff --git a/crypto/shash.c b/crypto/shash.c index 7a659733f94..2ccc8b0076c 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) ?: