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crypto: rsa - add a check for allocation failure

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Static checkers insist that the mpi_alloc() allocation can fail so add
a check to prevent a NULL dereference.  Small allocations like this
can't actually fail in current kernels, but adding a check is very
simple and makes the static checkers happy.

Fixes: 6637e11e4a ("crypto: rsa - allow only odd e and restrict value in FIPS mode")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Dan Carpenter 2023-10-30 12:02:59 +03:00 committed by Herbert Xu
parent fea845fd79
commit d872ca165c
1 changed files with 2 additions and 0 deletions
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crypto/rsa.c
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@ -220,6 +220,8 @@ static int rsa_check_exponent_fips(MPI e)
}
e_max = mpi_alloc(0);
if (!e_max)
return -ENOMEM;
mpi_set_bit(e_max, 256);
if (mpi_cmp(e, e_max) >= 0) {