From: Doan Tran Cong Danh Date: Wed, 27 Nov 2019 15:13:21 GMT Subject: [PATCH 5/5] mingw: use {gm,local}time_s as backend for {gm,local}time_r Message-ID: <2c39f9a04f98fc3d365c80ce57e8edce305846fb.1574867409.git.congdanhqx@gmail.com> In-Reply-To: Since Windows doesn't provide gmtime_r(3) and localtime_r(3), we're providing a compat version by using non-reentrant gmtime(3) and localtime(3) as backend. Then, we copy the returned data into the buffer. By doing that, in case of failure, we will dereference a NULL pointer returned by gmtime(3), and localtime(3), and we always return a valid pointer instead of NULL. Drop the memcpy(3) by using gmtime_s, and localtime_s as backend on Windows, and make sure we will return NULL in case of failure. Cc: Johannes Sixt Cc: Johannes Schindelin Signed-off-by: Doan Tran Cong Danh --- compat/mingw.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/compat/mingw.c b/compat/mingw.c index fe609239dd..7b21f4eee5 100644 --- a/compat/mingw.c +++ b/compat/mingw.c @@ -1,6 +1,7 @@ #include "../git-compat-util.h" #include "win32.h" #include +#include #include #include "../strbuf.h" #include "../run-command.h" @@ -986,16 +987,16 @@ int pipe(int filedes[2]) struct tm *gmtime_r(const time_t *timep, struct tm *result) { - /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */ - memcpy(result, gmtime(timep), sizeof(struct tm)); - return result; + if (gmtime_s(result, timep) == 0) + return result; + return NULL; } struct tm *localtime_r(const time_t *timep, struct tm *result) { - /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */ - memcpy(result, localtime(timep), sizeof(struct tm)); - return result; + if (localtime_s(result, timep) == 0) + return result; + return NULL; } char *mingw_getcwd(char *pointer, int len) -- 2.24.0.158.gd77a74f4dd.dirty