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Fix null pointer dereference in mbedtls_mpi_exp_mod

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Fix a null pointer dereference in mbedtls_mpi_exp_mod(X, A, N, E, _RR) when
A is the value 0 represented with 0 limbs.

Make the code a little more robust against similar bugs.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2021-06-08 23:17:42 +02:00
parent 3637488eb4
commit 3da1a8ff39
2 changed files with 25 additions and 6 deletions
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4
tests/suites/test_suite_mpi.data
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@ -1079,19 +1079,15 @@ Base test mbedtls_mpi_exp_mod #6 (Negative base + exponent)
mbedtls_mpi_exp_mod:10:"-23":10:"-13":10:"29":10:"0":MBEDTLS_ERR_MPI_BAD_INPUT_DATA
Test mbedtls_mpi_exp_mod: 0 (null) ^ 0 (null) mod 9
depends_on:TEST_TEMPORARILY_DISABLED_BECAUSE_IT_CAUSES_A_CRASH
mbedtls_mpi_exp_mod:16:"":16:"":16:"09":16:"1":0
Test mbedtls_mpi_exp_mod: 0 (null) ^ 0 (1 limb) mod 9
depends_on:TEST_TEMPORARILY_DISABLED_BECAUSE_IT_CAUSES_A_CRASH
mbedtls_mpi_exp_mod:16:"":16:"00":16:"09":16:"1":0
Test mbedtls_mpi_exp_mod: 0 (null) ^ 1 mod 9
depends_on:TEST_TEMPORARILY_DISABLED_BECAUSE_IT_CAUSES_A_CRASH
mbedtls_mpi_exp_mod:16:"":16:"01":16:"09":16:"":0
Test mbedtls_mpi_exp_mod: 0 (null) ^ 2 mod 9
depends_on:TEST_TEMPORARILY_DISABLED_BECAUSE_IT_CAUSES_A_CRASH
mbedtls_mpi_exp_mod:16:"":16:"02":16:"09":16:"":0
Test mbedtls_mpi_exp_mod: 0 (1 limb) ^ 0 (null) mod 9