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multi: kill off remaining internal handles in curl_multi_cleanup

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- if there are pending internal handles left in the list, they are
  leftovers (from for example Doh) and must be freed.

- unlink_all_msgsent_handles() did not properly move all msgsent
  handles over to the process list as intended

Fixes a DoH memory leak found by oss-fuzz.

Add test 2101 that can reproduce and verify.

Closes #16674
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Daniel Stenberg 2025-03-11 17:40:21 +01:00
parent 41a15c8e74
commit b1faac8039
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3 changed files with 56 additions and 4 deletions
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tests/data/Makefile.am
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@ -252,7 +252,7 @@ test2064 test2065 test2066 test2067 test2068 test2069 test2070 test2071 \
test2072 test2073 test2074 test2075 test2076 test2077 test2078 test2079 \
test2080 test2081 test2082 test2083 test2084 test2085 test2086 test2087 \
\
test2100 \
test2100 test2101 \
\
test2200 test2201 test2202 test2203 test2204 test2205 \
\