diff --git a/opensc-0.23.0-constant-time-pkcs1.5.patch b/opensc-0.23.0-constant-time-pkcs1.5.patch
index e24f05f..cd5393f 100644
--- a/opensc-0.23.0-constant-time-pkcs1.5.patch
+++ b/opensc-0.23.0-constant-time-pkcs1.5.patch
@@ -438,3 +438,38 @@ index 66dfcdde67..7239b4c5b8 100644
  /* Debug virtual slots. S is slot to be highlighted or NULL
   * C is a comment format string and args It will be preceded by "VSS " */
  #define DEBUG_VSS(S, ...) do { sc_log(context,"VSS " __VA_ARGS__); _debug_virtual_slots(S); } while (0)
+
+diff --git a/src/libopensc/padding.c b/src/libopensc/padding.c
+index ceb2a1e21..c2cc58d47 100644
+--- a/src/libopensc/padding.c
++++ b/src/libopensc/padding.c
+@@ -192,7 +192,7 @@ int
+ sc_pkcs1_strip_02_padding_constant_time(sc_context_t *ctx, unsigned int n, const u8 *data, unsigned int data_len, u8 *out, unsigned int *out_len)
+ {
+ 	unsigned int i = 0;
+-	u8 *msg = NULL;
++	u8 *msg, *msg_orig = NULL;
+ 	unsigned int good, found_zero_byte, mask;
+ 	unsigned int zero_index = 0, msg_index, mlen = -1, len = 0;
+ 	LOG_FUNC_CALLED(ctx);
+@@ -200,7 +200,7 @@ sc_pkcs1_strip_02_padding_constant_time(sc_context_t *ctx, unsigned int n, const
+ 	if (data == NULL || data_len <= 0 || data_len > n || n < SC_PKCS1_PADDING_MIN_SIZE)
+ 		LOG_FUNC_RETURN(ctx, SC_ERROR_INTERNAL);
+ 
+-	msg = calloc(n, sizeof(u8));
++	msg = msg_orig = calloc(n, sizeof(u8));
+ 	if (msg == NULL)
+ 		LOG_FUNC_RETURN(ctx, SC_ERROR_INTERNAL);
+ 
+@@ -261,7 +261,7 @@ sc_pkcs1_strip_02_padding_constant_time(sc_context_t *ctx, unsigned int n, const
+ 		out[i] = constant_time_select_8(mask, msg[msg_index], out[i]);
+ 	}
+ 
+-	free(msg);
++	free(msg_orig);
+ 	return constant_time_select(good, mlen, SC_ERROR_WRONG_PADDING);
+ }
+ 
+-- 
+2.43.0
+