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| author | David S. Miller <davem@davemloft.net> | 2012-04-02 14:31:19 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-04-02 14:31:19 -0700 |
| commit | 135ffda8b84226a91c6062db69a61975b2f11cb6 (patch) | |
| tree | 5aa71e41591bc7246f36bb55fbf7dc7daaefd9d1 /stdio-common/bug22.c | |
| parent | 302cadd343d26cfa9b043c213c2a38de259464d8 (diff) | |
Tighten up vfprintf width, precision, and total length overflow handling.
With help from Paul Eggert, Carlos O'Donell, and Roland McGrath.
* stdio-common/printf-parse.h (read_int): Change return type to
'int', return -1 on INT_MAX overflow.
* stdio-common/vfprintf.c (vfprintf): Validate width and precision
against overflow of INT_MAX. Set errno to EOVERFLOW when 'done'
overflows INT_MAX. Check for overflow of in-format-string precision
values properly. Use EOVERFLOW rather than ERANGE throughout. Use
SIZE_MAX not INT_MAX for integer overflow test.
* stdio-common/printf-parsemb.c: If read_int signals an overflow,
skip the construct in the format string but do not record anything.
* stdio-common/bug22.c: Adjust to test both width/prevision
INT_MAX overflow as well as total length INT_MAX overflow. Check
explicitly for proper errno values.
Diffstat (limited to 'stdio-common/bug22.c')
| -rw-r--r-- | stdio-common/bug22.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/stdio-common/bug22.c b/stdio-common/bug22.c index 2228388b47..efd9501368 100644 --- a/stdio-common/bug22.c +++ b/stdio-common/bug22.c @@ -1,12 +1,22 @@ /* BZ #5424 */ #include <stdio.h> +#include <errno.h> +/* INT_MAX + 1 */ #define N 2147483648 +/* (INT_MAX / 2) + 2 */ +#define N2 1073741825 + +/* INT_MAX - 3 */ +#define N3 2147483644 + #define STRINGIFY(S) #S #define MAKE_STR(S) STRINGIFY(S) #define SN MAKE_STR(N) +#define SN2 MAKE_STR(N2) +#define SN3 MAKE_STR(N3) static int do_test (void) @@ -20,11 +30,25 @@ do_test (void) return 1; } - ret = fprintf (fp, "%" SN "d%" SN "d", 1, 1); + ret = fprintf (fp, "%" SN "d", 1); + printf ("ret = %d\n", ret); + if (ret != -1 || errno != EOVERFLOW) + return 1; + + ret = fprintf (fp, "%." SN "d", 1); + printf ("ret = %d\n", ret); + if (ret != -1 || errno != EOVERFLOW) + return 1; + + ret = fprintf (fp, "%." SN3 "d", 1); + printf ("ret = %d\n", ret); + if (ret != -1 || errno != EOVERFLOW) + return 1; + ret = fprintf (fp, "%" SN2 "d%" SN2 "d", 1, 1); printf ("ret = %d\n", ret); - return ret != -1; + return ret != -1 || errno != EOVERFLOW; } #define TIMEOUT 30 |