diff options
| author | Nate Case <ncase@xes-inc.com> | 2008-05-12 20:14:14 (GMT) |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-05-15 10:49:52 (GMT) |
| commit | 9c8387afdc93f90bf0241411d44e011d8d5b76df (patch) | |
| tree | 97611f22b5a627f5d6067aae0bff6c32247fb577 | |
| parent | 64e4566f6d590fbb284da061b9b664c2486dd2de (diff) | |
| download | linux-9c8387afdc93f90bf0241411d44e011d8d5b76df.tar.xz | |
[POWERPC] Fix uninitialized variable bug in copy_{to|from}_user
Calls to copy_to_user() or copy_from_user() can fail when copying N
bytes, where N is a constant less than 8, but not 1, 2, 4, or 8,
because 'ret' is not initialized and is only set if the size is 1,
2, 4 or 8, but is tested after the switch statement for any constant
size <= 8. This fixes it by initializing 'ret' to 1, causing the
code to fall through to the __copy_tofrom_user call for sizes other
than 1, 2, 4 or 8.
Signed-off-by: Dave Scidmore <dscidmore@xes-inc.com>
Signed-off-by: Nate Case <ncase@xes-inc.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
| -rw-r--r-- | include/asm-powerpc/uaccess.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/asm-powerpc/uaccess.h b/include/asm-powerpc/uaccess.h index 8e798e3..1a0736f 100644 --- a/include/asm-powerpc/uaccess.h +++ b/include/asm-powerpc/uaccess.h @@ -380,7 +380,7 @@ static inline unsigned long __copy_from_user_inatomic(void *to, const void __user *from, unsigned long n) { if (__builtin_constant_p(n) && (n <= 8)) { - unsigned long ret; + unsigned long ret = 1; switch (n) { case 1: @@ -406,7 +406,7 @@ static inline unsigned long __copy_to_user_inatomic(void __user *to, const void *from, unsigned long n) { if (__builtin_constant_p(n) && (n <= 8)) { - unsigned long ret; + unsigned long ret = 1; switch (n) { case 1: |