From: Zooko O'Whielacronx <zooko@zooko.com>
Date: Thu, 1 Feb 2007 02:01:40 +0000 (-0700)
Subject: pyfec: fix precondition checks on k and m to actually check the value before coercing... 
X-Git-Tag: tahoe_v0.1.0-0-UNSTABLE~139
X-Git-Url: https://git.rkrishnan.org/?a=commitdiff_plain;h=10530a25bce47db2c7b1fd84d51158eb40a8d029;p=tahoe-lafs%2Ftahoe-lafs.git

pyfec: fix precondition checks on k and m to actually check the value before coercing it into a smaller type (oops)
---

diff --git a/pyfec/fec/_fecmodule.c b/pyfec/fec/_fecmodule.c
index e3d68c59..d1c31748 100644
--- a/pyfec/fec/_fecmodule.c
+++ b/pyfec/fec/_fecmodule.c
@@ -99,14 +99,15 @@ Encoder_init(Encoder *self, PyObject *args, PyObject *kwdict) {
         "m",
         NULL
     };
-    if (!PyArg_ParseTupleAndKeywords(args, kwdict, "ii", kwlist, &self->kk, &self->mm))
+    int ink, inm;
+    if (!PyArg_ParseTupleAndKeywords(args, kwdict, "ii", kwlist, &ink, &inm))
         return -1;
 
-    if (self->kk < 1) {
+    if (ink < 1) {
         py_raise_fec_error("Precondition violation: first argument is required to be greater than or equal to 1, but it was %d", self->kk);
 	return -1;
     }
-    if (self->mm < 1) {
+    if (inm < 1) {
         py_raise_fec_error("Precondition violation: second argument is required to be greater than or equal to 1, but it was %d", self->mm);
 	return -1;
     }
@@ -114,10 +115,12 @@ Encoder_init(Encoder *self, PyObject *args, PyObject *kwdict) {
         py_raise_fec_error("Precondition violation: second argument is required to be less than or equal to 255, but it was %d", self->mm);
 	return -1;
     }
-    if (self->kk > self->mm) {
-        py_raise_fec_error("Precondition violation: first argument is required to be less than or equal to the second argument, but they were %d and %d respectively", self->kk, self->mm);
+    if (ink > inm) {
+        py_raise_fec_error("Precondition violation: first argument is required to be less than or equal to the second argument, but they were %d and %d respectively", ink, inm);
 	return -1;
     }
+    self->kk = (unsigned char)ink;
+    self->mm = (unsigned char)inm;
     self->fec_matrix = fec_new(self->kk, self->mm);
 
     return 0;
@@ -352,14 +355,15 @@ Decoder_init(Encoder *self, PyObject *args, PyObject *kwdict) {
         NULL
     };
 
-    if (!PyArg_ParseTupleAndKeywords(args, kwdict, "ii", kwlist, &self->kk, &self->mm))
+    int ink, inm;
+    if (!PyArg_ParseTupleAndKeywords(args, kwdict, "ii", kwlist, &ink, &inm))
         return -1;
 
-    if (self->kk < 1) {
+    if (ink < 1) {
         py_raise_fec_error("Precondition violation: first argument is required to be greater than or equal to 1, but it was %d", self->kk);
 	return -1;
     }
-    if (self->mm < 1) {
+    if (inm < 1) {
         py_raise_fec_error("Precondition violation: second argument is required to be greater than or equal to 1, but it was %d", self->mm);
 	return -1;
     }
@@ -367,10 +371,12 @@ Decoder_init(Encoder *self, PyObject *args, PyObject *kwdict) {
         py_raise_fec_error("Precondition violation: second argument is required to be less than or equal to 255, but it was %d", self->mm);
 	return -1;
     }
-    if (self->kk > self->mm) {
-        py_raise_fec_error("Precondition violation: first argument is required to be less than or equal to the second argument, but they were %d and %d respectively", self->kk, self->mm);
+    if (ink > inm) {
+        py_raise_fec_error("Precondition violation: first argument is required to be less than or equal to the second argument, but they were %d and %d respectively", ink, inm);
 	return -1;
     }
+    self->kk = (unsigned char)ink;
+    self->mm = (unsigned char)inm;
     self->fec_matrix = fec_new(self->kk, self->mm);
 
     return 0;