[44.0.x] Fix leak in fd_renumber#13647
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alexcrichton merged 2 commits intoJun 15, 2026
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This commit fixes a file descriptor leak in the WASIp1 implementation of `fd_renumber` in the `wasmtime-wasi` crate. Notably the previous implementation did not fully close the file descriptor being renumbered-to which meant that the host's resources for the file, including the file descriptor, stayed alive. The fix here is to validate both fds exist and then delegate to the `fd_close` call to close the destination.
alexcrichton
requested review from
fitzgen and
pchickey
and removed request for
a team
dicej
approved these changes
Jun 15, 2026
alexcrichton
merged commit 100bfe2
into
bytecodealliance:release-44.0.0
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This commit fixes a file descriptor leak in the WASIp1 implementation of
fd_renumberin thewasmtime-wasicrate. Notably the previousimplementation did not fully close the file descriptor being
renumbered-to which meant that the host's resources for the file,
including the file descriptor, stayed alive. The fix here is to validate
both fds exist and then delegate to the
fd_closecall to close thedestination.
This additionally updates the behavior of
fd_renumberwhen renumberingto fds that weren't previously open to match the
mainbranch whichnotably rejects these calls.