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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 <yehuda@hq.newdream.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Yehuda Sadeh 2009-03-27 13:03:51 +08:00 committed by Herbert Xu
parent 3341323bb4
commit f4f689933c
1 changed files with 3 additions and 0 deletions
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3
crypto/shash.c
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@ -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)] u8 buf[shash_align_buffer_size(unaligned_len, alignmask)]
__attribute__ ((aligned)); __attribute__ ((aligned));
if (unaligned_len > len)
unaligned_len = len;
memcpy(buf, data, unaligned_len); memcpy(buf, data, unaligned_len);
return shash->update(desc, buf, unaligned_len) ?: return shash->update(desc, buf, unaligned_len) ?: