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| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-09-10 02:16:58 +0300 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-09-14 00:50:16 +0300 |
| commit | 8f035983dd826d7e04f67b28acf8e2f08c347e41 (patch) | |
| tree | fc89fcbf3277304dbc7d763898879d58ea9fdb8e | |
| parent | 917400cecb4b52b5cde5417348322bb9c8272fa6 (diff) | |
| download | linux-8f035983dd826d7e04f67b28acf8e2f08c347e41.tar.xz | |
blackfin: fix copy_from_user()
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | arch/blackfin/include/asm/uaccess.h | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/arch/blackfin/include/asm/uaccess.h b/arch/blackfin/include/asm/uaccess.h index 12f5d6851bbc..0a2a70096d8b 100644 --- a/arch/blackfin/include/asm/uaccess.h +++ b/arch/blackfin/include/asm/uaccess.h @@ -171,11 +171,12 @@ static inline int bad_user_access_length(void) static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n) { - if (access_ok(VERIFY_READ, from, n)) + if (likely(access_ok(VERIFY_READ, from, n))) { memcpy(to, (const void __force *)from, n); - else - return n; - return 0; + return 0; + } + memset(to, 0, n); + return n; } static inline unsigned long __must_check |