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Message-Id: <20201112205223.16120-1-ericonr@disroot.org>
Date: Thu, 12 Nov 2020 17:52:23 -0300
From: Érico Nogueira <ericonr@...root.org>
To: musl@...ts.openwall.com
Cc: Érico Rolim <ericonr@...root.org>
Subject: [PATCH v2] fix segfault in lutimes when tv argument is NULL
From: Érico Rolim <ericonr@...root.org>
calling lutimes with tv=0 is valid if the application wants to set the
timestamps to the current time. this commits makes it so the timespec
struct is populated with values from tv only if tv != 0 and calls
utimensat with times=0 if tv == 0.
---
This ended up basically being the patch from [1], but without the
erroneous validation.
- [1] https://www.openwall.com/lists/musl/2020/03/01/1
src/legacy/lutimes.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/src/legacy/lutimes.c b/src/legacy/lutimes.c
index 2e5502d1..dd465923 100644
--- a/src/legacy/lutimes.c
+++ b/src/legacy/lutimes.c
@@ -6,9 +6,11 @@
int lutimes(const char *filename, const struct timeval tv[2])
{
struct timespec times[2];
- times[0].tv_sec = tv[0].tv_sec;
- times[0].tv_nsec = tv[0].tv_usec * 1000;
- times[1].tv_sec = tv[1].tv_sec;
- times[1].tv_nsec = tv[1].tv_usec * 1000;
- return utimensat(AT_FDCWD, filename, times, AT_SYMLINK_NOFOLLOW);
+ if (tv) {
+ times[0].tv_sec = tv[0].tv_sec;
+ times[0].tv_nsec = tv[0].tv_usec * 1000;
+ times[1].tv_sec = tv[1].tv_sec;
+ times[1].tv_nsec = tv[1].tv_usec * 1000;
+ }
+ return utimensat(AT_FDCWD, filename, tv ? times : 0, AT_SYMLINK_NOFOLLOW);
}
--
2.29.2
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