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| author | Mark Salter <msalter@redhat.com> | 2011-10-04 09:17:36 -0400 |
|---|---|---|
| committer | Mark Salter <msalter@redhat.com> | 2011-10-06 19:47:12 -0400 |
| commit | 830f5800acae17b972d264ab65fe54a7f10c1d82 (patch) | |
| tree | 0d7807cced390c174f540aad7c8bf51c5c48a059 | |
| parent | 3ee72ca99288f1de95ec9c570e43f531c8799f06 (diff) | |
| download | linux-830f5800acae17b972d264ab65fe54a7f10c1d82.tar.bz2 | |
fix default __strnlen_user macro
The existing __strnlen_user macro simply resolved to strnlen. However, the
count returned by strnlen_user should include the NULL byte. This patch
fixes the __strnlen_user macro to include the NULL byte in the count.
Signed-off-by: Mark Salter <msalter@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
| -rw-r--r-- | include/asm-generic/uaccess.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/asm-generic/uaccess.h b/include/asm-generic/uaccess.h index ac68c999b6c2..9788568f7978 100644 --- a/include/asm-generic/uaccess.h +++ b/include/asm-generic/uaccess.h @@ -289,9 +289,14 @@ strncpy_from_user(char *dst, const char __user *src, long count) * Return 0 on exception, a value greater than N if too long */ #ifndef __strnlen_user -#define __strnlen_user strnlen +#define __strnlen_user(s, n) (strnlen((s), (n)) + 1) #endif +/* + * Unlike strnlen, strnlen_user includes the nul terminator in + * its returned count. Callers should check for a returned value + * greater than N as an indication the string is too long. + */ static inline long strnlen_user(const char __user *src, long n) { if (!access_ok(VERIFY_READ, src, 1)) |