Cast the unsigned char to unsigned int before shifting left

This is needed to avoid automatic promotion to signed int.

Fixes #11853

[extended tests]

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11857)

1 files changed, 4 insertions, 4 deletions

diff --git a/crypto/pem/pvkfmt.c b/crypto/pem/pvkfmt.c
index e2f5702880..6d85a8a4e1 100644
--- a/crypto/pem/pvkfmt.c
+++ b/crypto/pem/pvkfmt.c
@@ -36,10 +36,10 @@ static unsigned int read_ledword(const unsigned char **in)
 {
     const unsigned char *p = *in;
     unsigned int ret;
-    ret = *p++;
-    ret |= (*p++ << 8);
-    ret |= (*p++ << 16);
-    ret |= (*p++ << 24);
+    ret = (unsigned int)*p++;
+    ret |= (unsigned int)*p++ << 8;
+    ret |= (unsigned int)*p++ << 16;
+    ret |= (unsigned int)*p++ << 24;
     *in = p;
     return ret;
 }