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conncache: fix multi-thread use of shared connection cache

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It could accidentally let the connection get used by more than one
thread, leading to double-free and more.

Reported-by: Christopher Reid
Fixes #4544
Closes #4557
This commit is contained in:
Daniel Stenberg 2019-12-09 11:53:54 +01:00
parent 9e891ff54d
commit ee263de7a3
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GPG key ID: 5CC908FDB71E12C2
8 changed files with 58 additions and 52 deletions
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6
tests/data/test1554
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@ -38,6 +38,8 @@ run 1: foobar and so on fun!
<- Mutex unlock
-> Mutex lock
<- Mutex unlock
-> Mutex lock
<- Mutex unlock
run 1: foobar and so on fun!
-> Mutex lock
<- Mutex unlock
@ -47,6 +49,8 @@ run 1: foobar and so on fun!
<- Mutex unlock
-> Mutex lock
<- Mutex unlock
-> Mutex lock
<- Mutex unlock
run 1: foobar and so on fun!
-> Mutex lock
<- Mutex unlock
@ -54,6 +58,8 @@ run 1: foobar and so on fun!
<- Mutex unlock
-> Mutex lock
<- Mutex unlock
-> Mutex lock
<- Mutex unlock
</datacheck>
</reply>