commit df8185eae31d5bb5c5c0fba254ea8558ac35e532
author Jaeden Amero <jaeden.amero@arm.com> Thu Nov 14 16:39:48 2019 +0000
committer GitHub <noreply@github.com> Thu Nov 14 16:39:48 2019 +0000
tree a29dada9dc09b031a51f5f4dcd43861262d914eb
parent b9b5f493d3b1df05339b90fdbdde23dbab3d4b49
parent 6ffac75995f2a6df3d2cb8df58d6522cb73fda17

Merge pull request #2923 from Patater/reduce-ram-pem-csr

x509write_csr: Reduce stack usage of mbedtls_x509write_csr_pem()

library/x509write_csr.c

diff --git a/library/x509write_csr.c b/library/x509write_csr.c
index ffbf436..23e3f78 100644
--- a/library/x509write_csr.c
+++ b/library/x509write_csr.c
@@ -264,17 +264,16 @@
                        void *p_rng )
 {
     int ret;
-    unsigned char output_buf[4096];
     size_t olen = 0;
 
-    if( ( ret = mbedtls_x509write_csr_der( ctx, output_buf, sizeof(output_buf),
+    if( ( ret = mbedtls_x509write_csr_der( ctx, buf, size,
                                    f_rng, p_rng ) ) < 0 )
     {
         return( ret );
     }
 
     if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_CSR, PEM_END_CSR,
-                                  output_buf + sizeof(output_buf) - ret,
+                                  buf + size - ret,
                                   ret, buf, size, &olen ) ) != 0 )
     {
         return( ret );