From fbe1a850b3b1522e9fc22319ccbbcd2ab05328d2 Mon Sep 17 00:00:00 2001 From: Ondrej Mosnacek Date: Thu, 13 Sep 2018 10:51:31 +0200 Subject: crypto: lrw - Fix out-of bounds access on counter overflow When the LRW block counter overflows, the current implementation returns 128 as the index to the precomputed multiplication table, which has 128 entries. This patch fixes it to return the correct value (127). Fixes: 64470f1b8510 ("[CRYPTO] lrw: Liskov Rivest Wagner, a tweakable narrow block cipher mode") Cc: # 2.6.20+ Reported-by: Eric Biggers Signed-off-by: Ondrej Mosnacek Signed-off-by: Herbert Xu --- crypto/lrw.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'crypto') diff --git a/crypto/lrw.c b/crypto/lrw.c index 393a782679c7..5504d1325a56 100644 --- a/crypto/lrw.c +++ b/crypto/lrw.c @@ -143,7 +143,12 @@ static inline int get_index128(be128 *block) return x + ffz(val); } - return x; + /* + * If we get here, then x == 128 and we are incrementing the counter + * from all ones to all zeros. This means we must return index 127, i.e. + * the one corresponding to key2*{ 1,...,1 }. + */ + return 127; } static int post_crypt(struct skcipher_request *req) -- cgit