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Fix integer overflow mbedtls_base64_decode()

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Fix potential integer overflows in the function mbedtls_base64_decode().
This overflow would mainly be exploitable in 32-bit systems and could
cause buffer bound checks to be bypassed.
This commit is contained in:
Andres AG 2017-01-18 17:21:03 +00:00 committed by Simon Butcher
parent 6a54336897
commit 4623d83c6f
2 changed files with 3 additions and 1 deletions
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2
ChangeLog
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@ -27,6 +27,8 @@ Bugfix
cause buffer bound checks to be bypassed. Found by Eyal Itkin.
* Fixed potential arithmetic overflow in mbedtls_md2_update() that could
cause buffer bound checks to be bypassed. Found by Eyal Itkin.
* Fixed potential arithmetic overflow in mbedtls_base64_decode() that could
cause buffer bound checks to be bypassed. Found by Eyal Itkin.
= mbed TLS 2.4.1 branch released 2016-12-13

2
library/base64.c
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@ -192,7 +192,7 @@ int mbedtls_base64_decode( unsigned char *dst, size_t dlen, size_t *olen,
return( 0 );
}
n = ( ( n * 6 ) + 7 ) >> 3;
n = ( 6 * ( n >> 3 ) ) + ( ( 6 * ( n & 0x7 ) + 7 ) >> 3 );
n -= j;
if( dst == NULL || dlen < n )