From 13f2c5ae14901c89c38f898496102afd9daeaf6d Mon Sep 17 00:00:00 2001
From: Eric Soroos <eric-github@soroos.net>
Date: Fri, 28 Oct 2022 14:11:25 +0200
Subject: [PATCH 1/5] Prevent DOS with large SAMPLESPERPIXEL in Tiff IFD

A large value in the SAMPLESPERPIXEL tag could lead to a memory and
runtime DOS in TiffImagePlugin.py when setting up the context for
image decoding.

diff --git a/src/PIL/TiffImagePlugin.py b/src/PIL/TiffImagePlugin.py
index 04a63bd2b44..46166fc6335 100644
--- a/src/PIL/TiffImagePlugin.py
+++ b/src/PIL/TiffImagePlugin.py
@@ -257,6 +257,8 @@
     (MM, 8, (1,), 1, (8, 8, 8), ()): ("LAB", "LAB"),
 }
 
+MAX_SAMPLESPERPIXEL = max(len(key_tp[4]) for key_tp in OPEN_INFO.keys())
+
 PREFIXES = [
     b"MM\x00\x2A",  # Valid TIFF header with big-endian byte order
     b"II\x2A\x00",  # Valid TIFF header with little-endian byte order
@@ -1396,6 +1398,12 @@ def _setup(self):
             SAMPLESPERPIXEL,
             3 if self._compression == "tiff_jpeg" and photo in (2, 6) else 1,
         )
+
+        if samples_per_pixel > MAX_SAMPLESPERPIXEL:
+            # DOS check, samples_per_pixel can be a Long, and we extend the tuple below
+            logger.error("More samples per pixel than can be decoded: %s", samples_per_pixel)
+            raise SyntaxError("Invalid value for samples per pixel")
+
         if samples_per_pixel < bps_actual_count:
             # If a file has more values in bps_tuple than expected,
             # remove the excess.

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<div class='path'>path: <a href='/guix/log/?id=cb38c7c169e467fd5c2a4e556fe9df8ff56ddb5d'>root</a>/<a href='/guix/log/gnu?id=cb38c7c169e467fd5c2a4e556fe9df8ff56ddb5d'>gnu</a>/<a href='/guix/log/gnu/home.scm?id=cb38c7c169e467fd5c2a4e556fe9df8ff56ddb5d'>home.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/home.scm?id=cb38c7c169e467fd5c2a4e556fe9df8ff56ddb5d&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-12-19 23:39:55 +0100'>2021-12-19</span></td><td><a href='/guix/commit/gnu/home.scm?id=ed818c66d371656c869f43d7a7cbbcfba2df647b'>home: Add gexp-compiler for home-environments.</a><span class='msg-avail'>...</span></td><td>Andrew Tropin</td></tr>
<tr><td><span title='2021-10-09 19:24:18 +0300'>2021-10-09</span></td><td><a href='/guix/commit/gnu/home.scm?id=0e8d2df0f1a4ab25c482e1c427c54e19903e62f3'>Move (gnu home-services) to (gnu home services).</a><span class='msg-avail'>...</span></td><td>Oleg Pykhalov</td></tr>
<tr><td><span title='2021-10-08 1<tr><td><span title='2020-01-12 00:19:10 +0100'>2020-01-12</span></td><td><a href='/guix/commit/doc/htmlxref.cnf?id=30d83f445b70ebce7f01eaa91c8f418ff0a98321'>doc: Update htmlxref.cnf.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
n title='2021-09-09 20:26:51 +0300'>2021-09-09</span></td><td><a href='/guix/commit/gnu/home.scm?id=994c66bf846774da5104537ef1037d6a5bc56995'>gnu: home: Add doc comment about the module.</a><span class='msg-avail'>...</span></td><td>Andrew Tropin</td></tr>
<tr><td><span title='2021-09-09 20:26:50 +0300'>2021-09-09</span></td><td><a href='/guix/commit/gnu/home.scm?id=7fcc64253c2c48fee96f7925453161eb2b3a709e'>home: Add home-environment.</a><span class='msg-avail'>...</span></td><td>Andrew Tropin</td></tr>