Fix potential access of null pointer (pp)

[openssl.git] / crypto / arm64cpuid.pl

diff --git a/crypto/arm64cpuid.pl b/crypto/arm64cpuid.pl
index c0af608142b972144283c1c2270ca23f057a714f..caa33875c93739e9f9645f1350078bb231bfeb69 100755 (executable)
--- a/crypto/arm64cpuid.pl
+++ b/crypto/arm64cpuid.pl
@@ -100,6 +100,26 @@ OPENSSL_cleanse:
        cbnz    x1,.Little      // len!=0?
        ret
 .size  OPENSSL_cleanse,.-OPENSSL_cleanse
+
+.globl CRYPTO_memcmp
+.type  CRYPTO_memcmp,%function
+.align 4
+CRYPTO_memcmp:
+       eor     w3,w3,w3
+       cbz     x2,.Lno_data    // len==0?
+.Loop_cmp:
+       ldrb    w4,[x0],#1
+       ldrb    w5,[x1],#1
+       eor     w4,w4,w5
+       orr     w3,w3,w4
+       subs    x2,x2,#1
+       b.ne    .Loop_cmp
+
+.Lno_data:
+       neg     w0,w3
+       lsr     w0,w0,#31
+       ret
+.size  CRYPTO_memcmp,.-CRYPTO_memcmp
 ___
 
 print $code;