python-pillow/SOURCES/CVE-2021-28678.patch

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2021-11-09 09:45:46 +00:00
From eaef29c3696cd021147e692360997f4c12377c60 Mon Sep 17 00:00:00 2001
From: Lumir Balhar <lbalhar@redhat.com>
Date: Mon, 14 Jun 2021 09:19:50 +0200
Subject: [PATCH 2/5] CVE-2021-28678
---
src/PIL/BlpImagePlugin.py | 43 +++++++++++++++++++++------------------
1 file changed, 23 insertions(+), 20 deletions(-)
diff --git a/src/PIL/BlpImagePlugin.py b/src/PIL/BlpImagePlugin.py
index d56d46c..846c83d 100644
--- a/src/PIL/BlpImagePlugin.py
+++ b/src/PIL/BlpImagePlugin.py
@@ -294,33 +294,36 @@ class _BLPBaseDecoder(ImageFile.PyDecoder):
raise IOError("Truncated Blp file")
return 0, 0
+ def _safe_read(self, length):
+ return ImageFile._safe_read(self.fd, length)
+
def _read_palette(self):
ret = []
for i in range(256):
try:
- b, g, r, a = struct.unpack("<4B", self.fd.read(4))
+ b, g, r, a = struct.unpack("<4B", self._safe_read(4))
except struct.error:
break
ret.append((b, g, r, a))
return ret
def _read_blp_header(self):
- self._blp_compression, = struct.unpack("<i", self.fd.read(4))
+ self._blp_compression, = struct.unpack("<i", self._safe_read(4))
- self._blp_encoding, = struct.unpack("<b", self.fd.read(1))
- self._blp_alpha_depth, = struct.unpack("<b", self.fd.read(1))
- self._blp_alpha_encoding, = struct.unpack("<b", self.fd.read(1))
- self._blp_mips, = struct.unpack("<b", self.fd.read(1))
+ self._blp_encoding, = struct.unpack("<b", self._safe_read(1))
+ self._blp_alpha_depth, = struct.unpack("<b", self._safe_read(1))
+ self._blp_alpha_encoding, = struct.unpack("<b", self._safe_read(1))
+ self._blp_mips, = struct.unpack("<b", self._safe_read(1))
- self.size = struct.unpack("<II", self.fd.read(8))
+ self.size = struct.unpack("<II", self._safe_read(8))
if self.magic == b"BLP1":
# Only present for BLP1
- self._blp_encoding, = struct.unpack("<i", self.fd.read(4))
- self._blp_subtype, = struct.unpack("<i", self.fd.read(4))
+ self._blp_encoding, = struct.unpack("<i", self._safe_read(4))
+ self._blp_subtype, = struct.unpack("<i", self._safe_read(4))
- self._blp_offsets = struct.unpack("<16I", self.fd.read(16 * 4))
- self._blp_lengths = struct.unpack("<16I", self.fd.read(16 * 4))
+ self._blp_offsets = struct.unpack("<16I", self._safe_read(16 * 4))
+ self._blp_lengths = struct.unpack("<16I", self._safe_read(16 * 4))
class BLP1Decoder(_BLPBaseDecoder):
@@ -333,7 +336,7 @@ class BLP1Decoder(_BLPBaseDecoder):
if self._blp_encoding in (4, 5):
data = bytearray()
palette = self._read_palette()
- _data = BytesIO(self.fd.read(self._blp_lengths[0]))
+ _data = BytesIO(self._safe_read(self._blp_lengths[0]))
while True:
try:
offset, = struct.unpack("<B", _data.read(1))
@@ -355,10 +358,10 @@ class BLP1Decoder(_BLPBaseDecoder):
def _decode_jpeg_stream(self):
from PIL.JpegImagePlugin import JpegImageFile
- jpeg_header_size, = struct.unpack("<I", self.fd.read(4))
- jpeg_header = self.fd.read(jpeg_header_size)
- self.fd.read(self._blp_offsets[0] - self.fd.tell()) # What IS this?
- data = self.fd.read(self._blp_lengths[0])
+ jpeg_header_size, = struct.unpack("<I", self._safe_read(4))
+ jpeg_header = self._safe_read(jpeg_header_size)
+ self._safe_read(self._blp_offsets[0] - self.fd.tell()) # What IS this?
+ data = self._safe_read(self._blp_lengths[0])
data = jpeg_header + data
data = BytesIO(data)
image = JpegImageFile(data)
@@ -380,7 +383,7 @@ class BLP2Decoder(_BLPBaseDecoder):
# Uncompressed or DirectX compression
if self._blp_encoding == BLP_ENCODING_UNCOMPRESSED:
- _data = BytesIO(self.fd.read(self._blp_lengths[0]))
+ _data = BytesIO(self._safe_read(self._blp_lengths[0]))
while True:
try:
offset, = struct.unpack("<B", _data.read(1))
@@ -394,7 +397,7 @@ class BLP2Decoder(_BLPBaseDecoder):
linesize = (self.size[0] + 3) // 4 * 8
for yb in range((self.size[1] + 3) // 4):
for d in decode_dxt1(
- self.fd.read(linesize),
+ self._safe_read(linesize),
alpha=bool(self._blp_alpha_depth)
):
data += d
@@ -402,13 +405,13 @@ class BLP2Decoder(_BLPBaseDecoder):
elif self._blp_alpha_encoding == BLP_ALPHA_ENCODING_DXT3:
linesize = (self.size[0] + 3) // 4 * 16
for yb in range((self.size[1] + 3) // 4):
- for d in decode_dxt3(self.fd.read(linesize)):
+ for d in decode_dxt3(self._safe_read(linesize)):
data += d
elif self._blp_alpha_encoding == BLP_ALPHA_ENCODING_DXT5:
linesize = (self.size[0] + 3) // 4 * 16
for yb in range((self.size[1] + 3) // 4):
- for d in decode_dxt5(self.fd.read(linesize)):
+ for d in decode_dxt5(self._safe_read(linesize)):
data += d
else:
raise BLPFormatError("Unsupported alpha encoding %r" % (
--
2.31.1