Merge branch '2.4.x' into 2.5.x

* 2.4.x:
  rand/rand.c: Mix the pool key in `rand_gate' and `rand_stretch'.
  rand/lcrand.c: Swap flags and max so generator not advertised as strong.
  pub/dh-kcdsa.c: Free the correct factor.
  math/limlee.c: Don't leak the factor vector on overall failure.
  math/limlee.c: Handle an abort from `pgen' correctly.
  math/pgen.c: Don't free the tester if it's not set up.
  math/ec-exp.h: Fix segfault when base point is at infinity.
  key/key-data.c (key_copydata): Fix catastrophic bug.
  key/key-data.c (key_split): Fix long-standing reference leak.
  key/key-misc.c (key_bytag): Don't give up because a by-id search fails.
  base/dispatch.c, etc.: Check that `rdrand' works.

diff --cc base/dispatch.c
index bea97b4,42c64ee..abd019f
--- 1/base/dispatch.c
--- 2/base/dispatch.c
+++ b/base/dispatch.c
@@@ -553,16 -597,7 +606,16 @@@ int cpu_feature_p(int feat
                 cpuid_features_p(CPUID1D_SSE2, CPUID1C_AESNI) &&
                 xmm_registers_available_p());
      CASE_CPUFEAT(X86_RDRAND, "x86:rdrand",
-                cpuid_features_p(0, CPUID1C_RDRAND));
+                cpuid_features_p(0, CPUID1C_RDRAND) && rdrand_works_p());
 +    CASE_CPUFEAT(X86_AVX, "x86:avx",
 +               cpuid_features_p(0, CPUID1C_AVX) &&
 +               xmm_registers_available_p());
 +    CASE_CPUFEAT(X86_SSSE3, "x86:ssse3",
 +               cpuid_features_p(0, CPUID1C_SSSE3) &&
 +               xmm_registers_available_p());
 +    CASE_CPUFEAT(X86_PCLMUL, "x86:pclmul",
 +               cpuid_features_p(0, CPUID1C_PCLMUL) &&
 +               xmm_registers_available_p());
  #endif
  #ifdef CAPMAP
  #  define FEATP__CASE(feat, tok)                                      \

diff --cc math/pgen.c
Simple merge