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Use-after-free bug in curl_multi_remove_handle() #4575

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MaxKellermann opened this issue Nov 8, 2019 · 2 comments
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Use-after-free bug in curl_multi_remove_handle() #4575

MaxKellermann opened this issue Nov 8, 2019 · 2 comments
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crash HTTP/2

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@MaxKellermann
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MaxKellermann commented Nov 8, 2019 •
edited by falconindy

59041f0 introduces a use-after-free bug in CURL 7.67.0 from inside curl_multi_remove_handle()

See MusicPlayerDaemon/MPD#681 (comment) for an explanation.
bagder added a commit that referenced this issue Nov 10, 2019
@bagder
remove_handle: clear expire timers after multi_done()
253c31c 
Since 59041f0, a new timer might be set in multi_done() so the clearing
of the timers need to happen afterwards!

Reported-by: Max Kellermann
Fixes #4575
@bagder bagder mentioned this issue Nov 10, 2019
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@bagder
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bagder commented Nov 10, 2019

@MaxKellermann, does #4583 fix the issue for you?

@eworm-de
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It does. (I am involved in the downstream Arch Linux bug report.)
Thanks a lot!

@bagder bagder closed this as completed in 13182b3 Nov 11, 2019
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remove_handle: clear expire timers after multi_done() curl/curl
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@bagder @eworm-de @MaxKellermann