mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-09 23:00:07 +00:00
stdio: fix vfscanf with matches longer than INT_MAX (bug 27650)
Patterns like %*[ can safely be used to match a great many characters, and it's quite realisitic to use them for more than INT_MAX characters from an IO stream. With the previous approach, after INT_MAX characters (v)fscanf would return successfully, indicating an end to the match, even though there wasn't one.
This commit is contained in:
parent
c2fd60a586
commit
b03e4d7bd2
@ -2479,11 +2479,6 @@ __vfscanf_internal (FILE *s, const char *format, va_list argptr,
|
||||
else
|
||||
not_in = 0;
|
||||
|
||||
if (width < 0)
|
||||
/* There is no width given so there is also no limit on the
|
||||
number of characters we read. Therefore we set width to
|
||||
a very high value to make the algorithm easier. */
|
||||
width = INT_MAX;
|
||||
|
||||
#ifdef COMPILE_WSCANF
|
||||
/* Find the beginning and the end of the scanlist. We are not
|
||||
@ -2647,7 +2642,7 @@ __vfscanf_internal (FILE *s, const char *format, va_list argptr,
|
||||
}
|
||||
}
|
||||
}
|
||||
while (--width > 0 && inchar () != WEOF);
|
||||
while ((width < 0 || --width > 0) && inchar () != WEOF);
|
||||
out:
|
||||
#else
|
||||
char buf[MB_LEN_MAX];
|
||||
@ -2732,7 +2727,7 @@ __vfscanf_internal (FILE *s, const char *format, va_list argptr,
|
||||
}
|
||||
}
|
||||
|
||||
if (--width <= 0)
|
||||
if (width >= 0 && --width <= 0)
|
||||
break;
|
||||
}
|
||||
while (inchar () != EOF);
|
||||
@ -2884,7 +2879,7 @@ __vfscanf_internal (FILE *s, const char *format, va_list argptr,
|
||||
assert (n <= MB_LEN_MAX);
|
||||
str += n;
|
||||
}
|
||||
while (--width > 0 && inchar () != WEOF);
|
||||
while ((width < 0 || --width > 0) && inchar () != WEOF);
|
||||
out2:
|
||||
#else
|
||||
do
|
||||
@ -2938,7 +2933,7 @@ __vfscanf_internal (FILE *s, const char *format, va_list argptr,
|
||||
}
|
||||
}
|
||||
}
|
||||
while (--width > 0 && inchar () != EOF);
|
||||
while ((width < 0 || --width > 0) && inchar () != EOF);
|
||||
#endif
|
||||
|
||||
if (__glibc_unlikely (now == read_in))
|
||||
|
Loading…
Reference in New Issue
Block a user