28349515133
43%

Ran 29 Jun 2026 04:56AM UTC

Jobs 1

Files 267

Run time 1min

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Committed 27 Jun 2026 11:33AM UTC coverage: 42.828% (-0.2%) from 42.995%

Build # 28349515133

Build Type

push

github

Committed by

flatcap

Commit Message

flags: check for NULL email and thread in mutt_thread_set_flag()

Prevent a SIGSEGV in mutt_thread_set_flag() by adding validation for
the Email pointer and its associated MuttThread.

Some callers in index/functions.c, such as op_main_read_thread() and
op_undelete_thread(), do not guard against shared->email being NULL
(which occurs when the mailbox is empty). If triggered, they pass a
NULL Email pointer to mutt_thread_set_flag(), causing a crash when
attempting to access the thread.

Additionally, even if the Email pointer is valid, its thread
association (e->thread) can be NULL. This happens when threading is
disabled, but can also occur when threading is enabled if the thread
tree has been cleared (e.g., via mutt_clear_threads() during a
rebuild, or mview_free() during teardown) and not yet rebuilt. If
mutt_thread_set_flag() is called in this transient state,
attempting to traverse the thread results in a SIGSEGV.

To address this, we now return early if the Email pointer is NULL,
verify that threading is enabled (preserving the "Threading is not
enabled" error message), and return early if the MuttThread pointer
itself is NULL.

Coverage Stats

12698 of 29649 relevant lines covered (42.83%)

5204.03 hits per line

Coverage Regressions

Lines	Coverage	∆	File
215	6.03	-3.52%	sidebar/functions_sidebar.c
160	0.0	0.0%	attach/functions.c
133	0.0	0.0%	sidebar/window.c
132	4.79	-0.0%	imap/imap.c
24	0.0	0.0%	sidebar/expando.c
1	97.96	-2.04%	compress/lz4.c

Jobs

ID	Job ID	Ran	Files	Coverage
1	28349515133.1	29 Jun 2026 04:56AM UTC	267	42.83	GitHub Action Run

neomutt / neomutt / 28349515133
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