Check public key is not NULL.

CVE-2015-0288
PR#3708

(Imported from upstream's 28a00bcd8e318da18031b2ac8778c64147cd54f9.)

Change-Id: I6d60691da4c6860f87c753c065e93e9d0704aba9
Reviewed-on: https://boringssl-review.googlesource.com/3750
Reviewed-by: Adam Langley <agl@google.com>
1 file changed