lib: quoted_printable_q_decode() - Use explicit type conversion to fix ubsan errors

diff --git a/src/lib-mail/quoted-printable.c b/src/lib-mail/quoted-printable.c
index 9bfbe35ca55d1f64215d5788cef36430ebcda0a9..2bdae5a493b15e145049daba2241d8dae84afb17 100644 (file)
--- a/src/lib-mail/quoted-printable.c
+++ b/src/lib-mail/quoted-printable.c
@@ -32,8 +32,8 @@ int quoted_printable_q_decode(const unsigned char *src, size_t src_size,
                        break;
 
                /* =<hex> */
-               hexbuf[0] = src[src_pos+1];
-               hexbuf[1] = src[src_pos+2];
+               hexbuf[0] = (char) src[src_pos+1];
+               hexbuf[1] = (char) src[src_pos+2];
 
                if (hex_to_binary(hexbuf, dest) == 0) {
                        src_pos += 2;