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s390/crypto: fix scatterwalk_unmap() callers in AES-GCM

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[ Upstream commit bd52cd5e23f134019b23f0c389db0f9a436e4576 ]

The argument of scatterwalk_unmap() is supposed to be the void* that was
returned by the previous scatterwalk_map() call.
The s390 AES-GCM implementation was instead passing the pointer to the
struct scatter_walk.

This doesn't actually break anything because scatterwalk_unmap() only uses
its argument under CONFIG_HIGHMEM and ARCH_HAS_FLUSH_ON_KUNMAP.

Fixes: bf7fa03870 ("s390/crypto: add s390 platform specific aes gcm support.")
Signed-off-by: Jann Horn <jannh@google.com>
Acked-by: Harald Freudenberger <freude@linux.ibm.com>
Link: https://lore.kernel.org/r/20220517143047.3054498-1-jannh@google.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jann Horn 2022-05-17 16:30:47 +02:00 committed by Greg Kroah-Hartman
parent 852261e4bd
commit 2798944556
1 changed files with 2 additions and 2 deletions
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4
arch/s390/crypto/aes_s390.c
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@ -861,7 +861,7 @@ static inline void _gcm_sg_unmap_and_advance(struct gcm_sg_walk *gw,
unsigned int nbytes)
{
gw->walk_bytes_remain -= nbytes;
scatterwalk_unmap(&gw->walk);
scatterwalk_unmap(gw->walk_ptr);
scatterwalk_advance(&gw->walk, nbytes);
scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
gw->walk_ptr = NULL;
@ -936,7 +936,7 @@ static int gcm_out_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
goto out;
}
scatterwalk_unmap(&gw->walk);
scatterwalk_unmap(gw->walk_ptr);
gw->walk_ptr = NULL;
gw->ptr = gw->buf;