[Rd] R crashes on sprintf with bad format specification (PR#13283)

[Duncan Murdoch]

On 12/11/2008 8:30 PM, ocheyett at bonddesk.com wrote:
> Full_Name: Oren Cheyette
> Version: 2.7.2
> OS: Win XP
> Submission from: (NULL) (64.161.123.194)
> 
> 
> Enter the following at the R command prompt:
>> sprintf("A %S %S %S XYZ", 1, 1, 1);
> 
> Note the erroneous capitalized %S instead of %s and the numeric inputs instead
> of strings. With strings there's no crash - R reports bad format
> specifications.

2.7.2 is obsolete, but I can confirm a crash on Windows with a recent 
R-devel.

The last few entries in the stack dump at the time of the crash are 
shown below; these make it look as though the problem is in the Trio 
library, so it may be hard to fix.

Duncan Murdoch


Rgui.exe caused an Access Violation at location 6c913fb3 in module R.dll 
Reading from location 00000001.

Registers:
eax=7fffffff ebx=00000000 ecx=00e17b21 edx=00000001 esi=00e1c83b 
edi=0000000a
eip=6c913fb3 esp=00e17944 ebp=00e17b3c iopl=0         nv up ei pl nz na 
po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000 
efl=00000206

Call stack:
6C913FB3  R.dll:6C913FB3  TrioFormatProcess  trio.c:2724

	...
	  while (length > 0)
	    {
 >	      size = TrioWriteWideStringCharacter(self, *wstring++, flags, 
length);
	      if (size == 0)
	break; /* while */
	...

6C916592  R.dll:6C916592  trio_vsprintf  trio.c:3771

	...
	    return status;
	
 >	  status = TrioFormatProcess(&data, format, parameters);
	  if (data.error != 0)
	    {
	...

6C911F62  R.dll:6C911F62  sprintf  compat.c:46

	...
	    va_end(ap);
	    return res;
 >	}
	
	
	...

6C889F1E  R.dll:6C889F1E  do_sprintf  sprintf.c:297

	...
	    sprintf(bit, fmtp, " NaN");
	else
 >	    sprintf(bit, fmtp, "NaN");
	    } else if (x == R_PosInf) {
	if (strcspn(fmtp, "+") < strlen(fmtp))
	...