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Fix potential NULL dereference.

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Introduced when moving from gmtime_r() to gmtime().
Found with fbinfer.
This commit is contained in:
Manuel Pégourié-Gonnard 2015-06-22 18:59:21 +02:00
parent e91e21cf1b
commit 57e10d71be
1 changed files with 24 additions and 10 deletions
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22
library/x509.c
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@ -820,9 +820,13 @@ int mbedtls_x509_key_size_helper( char *buf, size_t buf_size, const char *name )
}
#if defined(MBEDTLS_HAVE_TIME_DATE)
/*
* Set the time structure to the current time.
* Return 0 on success, non-zero on failure.
*/
#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
static int x509_get_current_time( mbedtls_x509_time *now )
{
#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
SYSTEMTIME st;
GetSystemTime( &st );
@ -833,9 +837,15 @@ static int x509_get_current_time( mbedtls_x509_time *now )
now->hour = st.wHour;
now->min = st.wMinute;
now->sec = st.wSecond;
return( 0 );
}
#else
static int x509_get_current_time( mbedtls_x509_time *now )
{
struct tm *lt;
time_t tt;
int ret = 0;
#if defined(MBEDTLS_THREADING_C)
if( mbedtls_mutex_lock( &mbedtls_threading_gmtime_mutex ) != 0 )
@ -845,22 +855,26 @@ static int x509_get_current_time( mbedtls_x509_time *now )
tt = time( NULL );
lt = gmtime( &tt );
if( lt == NULL )
ret = -1;
else
{
now->year = lt->tm_year + 1900;
now->mon = lt->tm_mon + 1;
now->day = lt->tm_mday;
now->hour = lt->tm_hour;
now->min = lt->tm_min;
now->sec = lt->tm_sec;
}
#if defined(MBEDTLS_THREADING_C)
if( mbedtls_mutex_unlock( &mbedtls_threading_gmtime_mutex ) != 0 )
return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
#endif
#endif /* _WIN32 && !EFIX64 && !EFI32 */
return( 0 );
return( ret );
}
#endif /* _WIN32 && !EFIX64 && !EFI32 */
/*
* Return 0 if before <= after, 1 otherwise