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Fix null pointer dereference in mpi_mod_int(0, 2)

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Fix a null pointer dereference when performing some operations on zero
represented with 0 limbs: mbedtls_mpi_mod_int() dividing by 2, or
mbedtls_mpi_write_string() in base 2.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2022-06-09 19:32:46 +02:00
parent 8776042e44
commit c9529f9649
3 changed files with 17 additions and 1 deletions
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2
library/bignum.c
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@ -1829,7 +1829,7 @@ int mbedtls_mpi_mod_int( mbedtls_mpi_uint *r, const mbedtls_mpi *A, mbedtls_mpi_
/*
* handle trivial cases
*/
if( b == 1 )
if( b == 1 || A->n == 0 )
{
*r = 0;
return( 0 );