Fix a latent issue with chunkmemset #1196
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It would seem that on some platforms, namely those which are !UNALIGNED64_OK, there was a likelihood of chunkmemset_safe_c copying all the bytes before passing control flow to chunkcopy, a function which is explicitly unsafe to be called with a zero length copy. This fixes that bug for those platforms.
Codecov Report
@@ Coverage Diff @@
## develop #1196 +/- ##
===========================================
+ Coverage 87.06% 87.08% +0.01%
===========================================
Files 113 113
Lines 9698 9700 +2
Branches 2464 2465 +1
===========================================
+ Hits 8444 8447 +3
- Misses 997 1002 +5
+ Partials 257 251 -6
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Dead2
approved these changes
Mar 18, 2022
KungFuJesus
commented
Mar 18, 2022
| if (len) | ||
| return CHUNKMEMSET(out, dist, len); | ||
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|
||
| return out; |
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Hah, interesting that the coverage check shows this as never being hit until we revert the window layout. It definitely explains why we don't hit this issue until then. In any case, this coverage drop will disappear after #1178 so it's definitely not something that bothers me.
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That's why some bugs can take years to manifest and are hard to reproduce... Sometimes it's matter of hitting cascade event before all bugs are found.
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Changes since 2.0.6: - Fix CVE-2022-37434 #1328 - Fix chunkmemset #1196 - Fix deflateBound too small #1236 - Fix Z_SOLO #1263 - Fix ACLE variant of crc32 #1274 - Fix inflateBack #1311 - Fix deflate_quick windowsize #1431 - Fix DFLTCC bugs related to adler32 #1349 and #1390 - Fix warnings #1194 #1312 #1362 - MacOS build fix #1198 - Add invalid windowBits handling #1293 - Support for Force TZCNT #1186 - Support for aligned_alloc() #1360 - Minideflate improvements #1175 #1238 - Dont use unaligned access for memcpy #1309 - Build system #1209 #1233 #1267 #1273 #1278 #1292 #1316 #1318 #1365 - Test improvements #1208 #1227 #1241 #1353 - Cleanup #1266 - Documentation #1205 #1359 - Misc improvements #1294 #1297 #1306 #1344 #1348 - Backported zlib fixes - Backported CI workflows from Develop branch
Dead2
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Mar 17, 2023
Changes since 2.0.6: - Fix CVE-2022-37434 #1328 - Fix chunkmemset #1196 - Fix deflateBound too small #1236 - Fix Z_SOLO #1263 - Fix ACLE variant of crc32 #1274 - Fix inflateBack #1311 - Fix deflate_quick windowsize #1431 - Fix DFLTCC bugs related to adler32 #1349 and #1390 - Fix warnings #1194 #1312 #1362 - MacOS build fix #1198 - Add invalid windowBits handling #1293 - Support for Force TZCNT #1186 - Support for aligned_alloc() #1360 - Minideflate improvements #1175 #1238 - Dont use unaligned access for memcpy #1309 - Build system #1209 #1233 #1267 #1273 #1278 #1292 #1316 #1318 #1365 - Test improvements #1208 #1227 #1241 #1353 - Cleanup #1266 - Documentation #1205 #1359 - Misc improvements #1294 #1297 #1306 #1344 #1348 - Backported zlib fixes - Backported CI workflows from Develop branch
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It would seem that on some platforms, namely those which are
!UNALIGNED64_OK, there was a likelihood of chunkmemset_safe_c copying all
the bytes before passing control flow to chunkcopy, a function which is
explicitly unsafe to be called with a zero length copy.
This fixes that bug for those platforms.