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bignum: fix memory leak in GCD with 0 as an input

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Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
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Manuel Pégourié-Gonnard
2025-08-11 10:45:41 +02:00
parent 381d4ba03b
commit 87e77d6516
1 changed files with 4 additions and 2 deletions
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6
library/bignum.c
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@@ -1841,10 +1841,12 @@ int mbedtls_mpi_gcd(mbedtls_mpi *G, const mbedtls_mpi *A, const mbedtls_mpi *B)
/* Handle special cases (that don't happen in crypto usage) */ /* Handle special cases (that don't happen in crypto usage) */
if (mbedtls_mpi_core_check_zero_ct(TA.p, TA.n) == MBEDTLS_CT_FALSE) { if (mbedtls_mpi_core_check_zero_ct(TA.p, TA.n) == MBEDTLS_CT_FALSE) {
return mbedtls_mpi_copy(G, &TB); // GCD(0, B) = abs(B) MBEDTLS_MPI_CHK(mbedtls_mpi_copy(G, &TB)); // GCD(0, B) = abs(B)
goto cleanup;
} }
if (mbedtls_mpi_core_check_zero_ct(TB.p, TB.n) == MBEDTLS_CT_FALSE) { if (mbedtls_mpi_core_check_zero_ct(TB.p, TB.n) == MBEDTLS_CT_FALSE) {
return mbedtls_mpi_copy(G, &TA); // GCD(A, 0) = abs(A) MBEDTLS_MPI_CHK(mbedtls_mpi_copy(G, &TA)); // GCD(A, 0) = abs(A)
goto cleanup;
} }
const size_t za = mbedtls_mpi_lsb(&TA); const size_t za = mbedtls_mpi_lsb(&TA);