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Differential D21000

Fix leak of memory and file refs with sendmsg(2) over unix domain sockets.
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Authored by kib on Jul 19 2019, 7:40 PM.
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rS350156: Fix leak of memory and file refs with sendmsg(2) over unix domain sockets.
Summary

When sendmsg(2) sucessfully internalized one SCM_RIGHTS control message, but failed to process some other control message later, both file references and filedescent memory needs to be freed. This was not done, only mbuf chain was freed.

Noted by: markj

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rS FreeBSD src repository - subversion
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Event Timeline

kib created this revision.Jul 19 2019, 7:40 PM
Herald added a subscriber: imp. · View Herald TranscriptJul 19 2019, 7:40 PM
Harbormaster completed remote builds in B25428: Diff 59940.Jul 19 2019, 7:40 PM
markj accepted this revision.Jul 19 2019, 7:56 PM
markj added inline comments.
sys/kern/uipc_usrreq.c
2124 ↗(On Diff #59940)

td seems to be unused.

2163 ↗(On Diff #59940)

Could you move the initialization of control here? I think that would make it a bit easier to see what's going on.

2165 ↗(On Diff #59940)

I don't understand where the name icontrolp comes from.

This revision is now accepted and ready to land.Jul 19 2019, 7:56 PM
kib marked 2 inline comments as done.Jul 19 2019, 8:15 PM
kib added inline comments.
sys/kern/uipc_usrreq.c
2165 ↗(On Diff #59940)

Do you mean that you do not see what the contraction means ? I renamed the var to initial_controlp.

kib updated this revision to Diff 59941.Jul 19 2019, 8:16 PM

Remove unused arg.
Move initializations around.
Rename the var.

This revision now requires review to proceed.Jul 19 2019, 8:16 PM
Harbormaster completed remote builds in B25429: Diff 59941.Jul 19 2019, 8:16 PM
markj accepted this revision.Jul 19 2019, 8:19 PM
markj added inline comments.
sys/kern/uipc_usrreq.c
2165 ↗(On Diff #59940)

Ah, I assumed it meant "input controlp".

This revision is now accepted and ready to land.Jul 19 2019, 8:19 PM
Closed by commit rS350156: Fix leak of memory and file refs with sendmsg(2) over unix domain sockets. (authored by kib). · Explain WhyJul 19 2019, 8:51 PM
This revision was automatically updated to reflect the committed changes.
kib added a commit: rS350156: Fix leak of memory and file refs with sendmsg(2) over unix domain sockets..

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sys/
kern/
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Diff 59943

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head/sys/kern/uipc_usrreq.c

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