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Check for max error code overflow 

If do not check the overflow of the maximum error code (15841), this can lead to a program crash.
pull/1196/head
0x9ef 2019-07-16 21:38:19 +03:00 committed by Alexander Medvednikov
parent 5d0cb1437c
commit 91a712fdf0
1 changed files with 12 additions and 0 deletions
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12
vlib/os/os_win.v
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@ -59,8 +59,17 @@ const (
LANG_NEUTRAL = (SUBLANG_NEUTRAL)
)
// Ref - https://docs.microsoft.com/en-us/windows/win32/debug/system-error-codes--12000-15999-
const (
MAX_ERROR_CODE = 15841 // ERROR_API_UNAVAILABLE
)
fn ptr_get_error_message(code u32) voidptr {
mut buf := voidptr(0)
// Check for code overflow
if code > u32(MAX_ERROR_CODE) {
return buf
}
C.FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER
| FORMAT_MESSAGE_FROM_SYSTEM
@ -71,5 +80,8 @@ fn ptr_get_error_message(code u32) voidptr {
pub fn get_error_msg(code u32) string {
_ptrdata := ptr_get_error_message(code)
if _ptrdata == voidptr(0) {
return ''
}
return tos(_ptrdata, C.strlen(_ptrdata))
}