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Closes #15897: zipimport.c doesn't check return value of fseek()

This commit is contained in:
Jesus Cea 2012-10-03 02:13:05 +02:00
parent f532035551
commit 09bf7a799d
3 changed files with 40 additions and 7 deletions
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1
Misc/ACKS
View File

@ -227,6 +227,7 @@ Christopher A. Craig
Jeremy Craven
Laura Creighton
Simon Cross
Felipe Cruz
Drew Csillag
Joaquin Cuenca Abela
John Cugini

3
Misc/NEWS
View File

@ -49,6 +49,9 @@ Core and Builtins
- Issue #15020: The program name used to search for Python's path is now
"python3" under Unix, not "python".
- Issue #15897: zipimport.c doesn't check return value of fseek().
Patch by Felipe Cruz.
- Issue #15033: Fix the exit status bug when modules invoked using -m swith,
return the proper failure return value (1). Patch contributed by Jeff Knupp.

43
Modules/zipimport.c
View File

@ -741,7 +741,12 @@ read_directory(PyObject *archive_obj)
PyErr_Format(ZipImportError, "can't open Zip file: '%U'", archive_obj);
return NULL;
}
fseek(fp, -22, SEEK_END);
if (fseek(fp, -22, SEEK_END) == -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);
@ -773,11 +778,13 @@ read_directory(PyObject *archive_obj)
PyObject *t;
int err;
fseek(fp, header_offset, 0); /* Start of file header */
if (fseek(fp, header_offset, 0) == -1) /* Start of file header */
goto fseek_error;
l = PyMarshal_ReadLongFromFile(fp);
if (l != 0x02014B50)
break; /* Bad: Central Dir File Header */
fseek(fp, header_offset + 8, 0);
if (fseek(fp, header_offset + 8, 0) == -1)
goto fseek_error;
flags = (unsigned short)PyMarshal_ReadShortFromFile(fp);
compress = PyMarshal_ReadShortFromFile(fp);
time = PyMarshal_ReadShortFromFile(fp);
@ -789,7 +796,8 @@ read_directory(PyObject *archive_obj)
header_size = 46 + name_size +
PyMarshal_ReadShortFromFile(fp) +
PyMarshal_ReadShortFromFile(fp);
fseek(fp, header_offset + 42, 0);
if (fseek(fp, header_offset + 42, 0) == -1)
goto fseek_error;
file_offset = PyMarshal_ReadLongFromFile(fp) + arc_offset;
if (name_size > MAXPATHLEN)
name_size = MAXPATHLEN;
@ -849,6 +857,12 @@ read_directory(PyObject *archive_obj)
PySys_FormatStderr("# zipimport: found %ld names in %U\n",
count, archive_obj);
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);
@ -918,7 +932,12 @@ get_data(PyObject *archive, PyObject *toc_entry)
}
/* Check to make sure the local file header is correct */
fseek(fp, file_offset, 0);
if (fseek(fp, file_offset, 0) == -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 */
@ -928,7 +947,12 @@ get_data(PyObject *archive, PyObject *toc_entry)
fclose(fp);
return NULL;
}
fseek(fp, file_offset + 26, 0);
if (fseek(fp, file_offset + 26, 0) == -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 */
@ -945,8 +969,13 @@ get_data(PyObject *archive, PyObject *toc_entry)
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,