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evp: prevent underflow in base64 decoding

This patch resolves RT ticket #2608.

Thanks to Robert Dugal for originally spotting this, and to David
Ramos for noticing that the ball had been dropped.

Signed-off-by: Geoff Thorpe <geoff@openssl.org>
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geoffthorpe committed May 4, 2014
1 parent d8afda6 commit d0666f289ac013094bbbf547bfbcd616199b7d2d
Showing with 1 addition and 0 deletions.
  1. +1 −0 crypto/evp/encode.c
@@ -324,6 +324,7 @@ int EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
v=EVP_DecodeBlock(out,d,n);
n=0;
if (v < 0) { rv=0; goto end; }
if (eof > v) { rv=-1; goto end; }
ret+=(v-eof);
}
else

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