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Date: Tue, 12 Jan 2021 07:56:58 +0000
From: "zhuyan (M)" <zhuyan34@...wei.com>
To: "musl@...ts.openwall.com" <musl@...ts.openwall.com>
CC: Zengweilin <zengweilin@...wei.com>, "liucheng (G)"
<liucheng32@...wei.com>, "chenzefeng (A)" <chenzefeng2@...wei.com>
Subject: [PATCH] fix segfault in getitimer when old argument is NULL
When old is NULL, call old->it_interval.tv_sec to dereference a null pointer in getitimer.
The commit 558c01338b0b635632e70af6ec8a484ca70b0328 introduces this problem.
Signed-off-by: Qing Wu <wuqing30@...wei.com>
Signed-off-by: Yan Zhu <zhuyan34@...wei.com>
---
src/signal/getitimer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/signal/getitimer.c b/src/signal/getitimer.c index 36d1eb9d..f6fde204 100644
--- a/src/signal/getitimer.c
+++ b/src/signal/getitimer.c
@@ -6,7 +6,7 @@ int getitimer(int which, struct itimerval *old)
if (sizeof(time_t) > sizeof(long)) {
long old32[4];
int r = __syscall(SYS_getitimer, which, old32);
- if (!r) {
+ if (!r && old) {
old->it_interval.tv_sec = old32[0];
old->it_interval.tv_usec = old32[1];
old->it_value.tv_sec = old32[2];
--
2.12.3
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