diff -r a5a8d255daee Modules/zipimport.c
--- a/Modules/zipimport.c	Sat Sep 15 05:52:36 2012 +0300
+++ b/Modules/zipimport.c	Sat Sep 15 10:20:12 2012 -0300
@@ -868,6 +868,7 @@
     PyObject *path;
     const char *charset;
     int bootstrap;
+    int rc = 0;
 
     fp = _Py_fopen(archive, "rb");
     if (fp == NULL) {
@@ -875,7 +876,12 @@
             PyErr_Format(ZipImportError, "can't open Zip file: %R", archive);
         return NULL;
     }
-    fseek(fp, -22, SEEK_END);
+    rc = fseek(fp, -22, SEEK_END);
+    if (rc == -1) {
+        fclose(fp);
+        PyErr_Format(ZipImportError, "can't read Zip file: %R", archive);
+        return NULL;
+    }
     header_position = ftell(fp);
     if (fread(endof_central_dir, 1, 22, fp) != 22) {
         fclose(fp);
@@ -904,11 +910,15 @@
         PyObject *t;
         int err;
 
-        fseek(fp, header_offset, 0);  /* Start of file header */
+        rc = fseek(fp, header_offset, 0);  /* Start of file header */
+        if (rc == -1)
+            goto fseek_error;
         l = PyMarshal_ReadLongFromFile(fp);
         if (l != 0x02014B50)
             break;              /* Bad: Central Dir File Header */
-        fseek(fp, header_offset + 8, 0);
+        rc = fseek(fp, header_offset + 8, 0);
+        if (rc == -1)
+            goto fseek_error;
         flags = (unsigned short)PyMarshal_ReadShortFromFile(fp);
         compress = PyMarshal_ReadShortFromFile(fp);
         time = PyMarshal_ReadShortFromFile(fp);
@@ -920,7 +930,9 @@
         header_size = 46 + name_size +
            PyMarshal_ReadShortFromFile(fp) +
            PyMarshal_ReadShortFromFile(fp);
-        fseek(fp, header_offset + 42, 0);
+        rc = fseek(fp, header_offset + 42, 0);
+        if (rc == -1)
+            goto fseek_error;
         file_offset = PyMarshal_ReadLongFromFile(fp) + arc_offset;
         if (name_size > MAXPATHLEN)
             name_size = MAXPATHLEN;
@@ -980,6 +992,12 @@
         PySys_FormatStderr("# zipimport: found %ld names in %R\n",
                            count, archive);
     return files;
+fseek_error:
+    fclose(fp);
+    Py_XDECREF(files);
+    Py_XDECREF(nameobj);
+    PyErr_Format(ZipImportError, "can't read Zip file: %R", archive);
+    return NULL;
 error:
     fclose(fp);
     Py_XDECREF(files);
@@ -1050,7 +1068,13 @@
     }
 
     /* Check to make sure the local file header is correct */
-    fseek(fp, file_offset, 0);
+    err = fseek(fp, file_offset, 0);
+    if (err == -1) {
+        fclose(fp);
+        PyErr_Format(ZipImportError, "can't read Zip file: %R", archive);
+        return NULL;
+    }
+
     l = PyMarshal_ReadLongFromFile(fp);
     if (l != 0x04034B50) {
         /* Bad: Local File Header */
@@ -1060,7 +1084,13 @@
         fclose(fp);
         return NULL;
     }
-    fseek(fp, file_offset + 26, 0);
+    err = fseek(fp, file_offset + 26, 0);
+    if (err == -1) {
+        fclose(fp);
+        PyErr_Format(ZipImportError, "can't read Zip file: %R", archive);
+        return NULL;
+    }
+
     l = 30 + PyMarshal_ReadShortFromFile(fp) +
         PyMarshal_ReadShortFromFile(fp);        /* local header size */
     file_offset += l;           /* Start of file data */
@@ -1077,8 +1107,13 @@
     buf = PyBytes_AsString(raw_data);
 
     err = fseek(fp, file_offset, 0);
-    if (err == 0)
+    if (err == 0) {
         bytes_read = fread(buf, 1, data_size, fp);
+    } else {
+        fclose(fp);
+        PyErr_Format(ZipImportError, "can't read Zip file: %R", archive);
+        return NULL;
+    }
     fclose(fp);
     if (err || bytes_read != data_size) {
         PyErr_SetString(PyExc_IOError,