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padata: fix uninitialized return value in padata_replace() 

According to Geert's report[0],

  kernel/padata.c: warning: 'err' may be used uninitialized in this
    function [-Wuninitialized]:  => 539:2

Warning is seen only with older compilers on certain archs.  The
runtime effect is potentially returning garbage down the stack when
padata's cpumasks are modified before any pcrypt requests have run.

Simplest fix is to initialize err to the success value.

[0] http://lkml.kernel.org/r/20200210135506.11536-1-geert@linux-m68k.org

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Fixes: bbefa1dd6a ("crypto: pcrypt - Avoid deadlock by using per-instance padata queues")
Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: linux-crypto@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Daniel Jordan 2020-02-10 13:11:00 -05:00 committed by Herbert Xu
parent fcdba3c33a
commit 41ccdbfd54
1 changed files with 1 additions and 1 deletions
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2
kernel/padata.c
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@ -512,7 +512,7 @@ static int padata_replace_one(struct padata_shell *ps)
static int padata_replace(struct padata_instance *pinst)
{
struct padata_shell *ps;
int err;
int err = 0;
pinst->flags |= PADATA_RESET;