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List:       gmp-devel
Subject:    overflow in mpz_sizeinbase
From:       linus () nordberg ! se (Linus Nordberg)
Date:       2005-04-22 22:48:37
Message-ID: yszpswm3bsf.fsf () mingrillvagn ! nordberg ! se
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jweening@ccrwest.org (Joe Weening) wrote
Wed, 20 Apr 2005 17:25:22 -0700 (PDT):

|  This causes the "size" argument of MPN_SIZEINBASE to be of type "int",
|  and the computation
|  
|          __totbits = (size) * GMP_NUMB_BITS - (__cnt - GMP_NAIL_BITS);   \
|  
|  in gmp-impl.h overflows when (size) * GMP_NUMB_BITS is 2^31 or more,

This problem is addressed in the gmp-impl.h.MPN_SIZEINBASE.diff [1]
patch, announced on the GMP pages under "Status of the current
release" [2].

Please keep bug reports on the gmp-bugs@swox.com.  (My fault approving
this to the developers list.  Sorry for that.)

[1] http://swox.com/gmp/patches/gmp-impl.h.MPN_SIZEINBASE.diff
[2] http://swox.com/gmp/#STATUS

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