The branch main has been updated by jilles:
URL:
https://cgit.FreeBSD.org/src/commit/?id=5a1a07f2a0e10179d38d8112fb5568e2b510b28c
commit 5a1a07f2a0e10179d38d8112fb5568e2b510b28c
Author: Jilles Tjoelker <jil...@freebsd.org>
AuthorDate: 2022-01-23 21:15:57 +0000
Commit: Jilles Tjoelker <jil...@freebsd.org>
CommitDate: 2022-01-26 22:13:20 +0000
sh: Don't add something to a null pointer
Pointer arithmetic on a null pointer is undefined behavior.
The bug can be reproduced by running bin/sh/tests/builtins/wait6.0 with
UBSAN.
Reported by: Mark Millard
Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D34011
---
bin/sh/jobs.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/bin/sh/jobs.c b/bin/sh/jobs.c
index c0ba7d75e16d..ff36bfa6d999 100644
--- a/bin/sh/jobs.c
+++ b/bin/sh/jobs.c
@@ -587,6 +587,8 @@ waitcmdloop(struct job *job)
return retval;
}
} else {
+ if (njobs == 0)
+ return 0;
for (jp = jobtab ; jp < jobtab + njobs; jp++)
if (jp->used && jp->state == JOBDONE) {
if (! iflag || ! jp->changed)
