commit 0c7ac6f8e603b7e33c7ee268c30f2de59111951c
Author: Joy Latten <[EMAIL PROTECTED]>
Date: Wed Mar 12 12:17:45 2008 +0800
CRYPTO xcbc: Fix crash with IPsec
[ Upstream commit: 2f40a178e70030c4712fe63807c883f34c3645eb ]
When using aes-xcbc-mac for authentication in IPsec,
the kernel crashes. It seems this algorithm doesn't
account for the space IPsec may make in scatterlist for authtag.
Thus when crypto_xcbc_digest_update2() gets called,
nbytes may be less than sg[i].length.
Since nbytes is an unsigned number, it wraps
at the end of the loop allowing us to go back
into loop and causing crash in memcpy.
I used update function in digest.c to model this fix.
Please let me know if it looks ok.
Signed-off-by: Joy Latten <[EMAIL PROTECTED]>
Signed-off-by: Herbert Xu <[EMAIL PROTECTED]>
Signed-off-by: Chris Wright <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
diff --git a/crypto/xcbc.c b/crypto/xcbc.c
index ac68f3b..a957373 100644
--- a/crypto/xcbc.c
+++ b/crypto/xcbc.c
@@ -124,6 +124,11 @@ static int crypto_xcbc_digest_update2(struct hash_desc
*pdesc,
unsigned int offset = sg[i].offset;
unsigned int slen = sg[i].length;
+ if (unlikely(slen > nbytes))
+ slen = nbytes;
+
+ nbytes -= slen;
+
while (slen > 0) {
unsigned int len = min(slen, ((unsigned
int)(PAGE_SIZE)) - offset);
char *p = crypto_kmap(pg, 0) + offset;
@@ -177,7 +182,6 @@ static int crypto_xcbc_digest_update2(struct hash_desc
*pdesc,
offset = 0;
pg++;
}
- nbytes-=sg[i].length;
i++;
} while (nbytes>0);
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