[linux] fix segfault when eventpoll fdinfo is unavailable - #368
Merged
jiegec merged 1 commit intoAug 12, 2026
Conversation
jiegec
reviewed
Aug 11, 2026
process_id() pre-fills -1 sentinels for the oty == 0 case, but tfd_count is size_t, so -1 becomes SIZE_MAX and the `fi.tfd_count > 0` guard passes where the `!= -1` siblings skip. snp_eventpoll() then qsorts SIZE_MAX entries of a 32-entry array. Declare it ssize_t so the sentinel compares as negative while the struct layout stays the same.
daeho-ro
force-pushed
the
fix-eventpoll-tfd-count-sentinel
branch
from
August 12, 2026 14:08
fdebebf to
e1f8076
Compare
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
tfd_countis declaredsize_t(dproc.c:97), butprocess_id()uses-1as its "no fdinfo" sentinel (dproc.c:1222). It becomesSIZE_MAX, so thefi.tfd_count > 0guard passes where the!= -1siblings skip, andsnp_eventpoll()qsortsSIZE_MAXentries of a 32-entry array:This hits any run with
OffType != OFFSET_FDINFOthat reports a process holding an epoll descriptor. Declaring itintmatchestfds[]and theeventfd_id/pidsentinels.