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| author |   Christophe Leroy <christophe.leroy@c-s.fr> | 2019-08-14 09:25:52 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-08-20 21:22:12 +1000 |
| commit | 38a0d0cdb46d3f91534e5b9839ec2d67be14c59d (patch) | |
| tree | 6dfb7e46f2079b44b395fcbf46f6cadda79c7b88 | |
| parent | powerpc/kasan: Fix shadow area set up for modules. (diff) | |
| download | linux-dev-38a0d0cdb46d3f91534e5b9839ec2d67be14c59d.tar.xz linux-dev-38a0d0cdb46d3f91534e5b9839ec2d67be14c59d.zip | |
powerpc/futex: Fix warning: 'oldval' may be used uninitialized in this function
We see warnings such as:
kernel/futex.c: In function 'do_futex':
kernel/futex.c:1676:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized]
return oldval == cmparg;
^
kernel/futex.c:1651:6: note: 'oldval' was declared here
int oldval, ret;
^
This is because arch_futex_atomic_op_inuser() only sets *oval if ret
is 0 and GCC doesn't see that it will only use it when ret is 0.
Anyway, the non-zero ret path is an error path that won't suffer from
setting *oval, and as *oval is a local var in futex_atomic_op_inuser()
it will have no impact.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: reword change log slightly]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/86b72f0c134367b214910b27b9a6dd3321af93bb.1565774657.git.christophe.leroy@c-s.fr
| -rw-r--r-- | arch/powerpc/include/asm/futex.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/futex.h b/arch/powerpc/include/asm/futex.h index 3a6aa57b9d90..eea28ca679db 100644 --- a/arch/powerpc/include/asm/futex.h +++ b/arch/powerpc/include/asm/futex.h @@ -60,8 +60,7 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, pagefault_enable(); - if (!ret) - *oval = oldval; + *oval = oldval; prevent_write_to_user(uaddr, sizeof(*uaddr)); return ret; |