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powerpc/sstep: Fix array out of bound warning

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Compiling kernel with -Warray-bounds throws below warning:

  In function 'emulate_vsx_store':
  warning: array subscript is above array bounds [-Warray-bounds]
  buf.d[2] = byterev_8(reg->d[1]);
  ~~~~~^~~
  buf.d[3] = byterev_8(reg->d[0]);
  ~~~~~^~~

Fix it by using temporary array variable 'union vsx_reg buf32[]' in
that code block. Also, with element_size = 32, 'union vsx_reg *reg'
is an array of size 2. So, use 'reg' as an array instead of pointer
in the same code block.

Fixes: af99da7433 ("powerpc/sstep: Support VSX vector paired storage access instructions")
Suggested-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Tested-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210129071745.111466-1-ravi.bangoria@linux.ibm.com
This commit is contained in:
Ravi Bangoria 2021-01-29 12:47:45 +05:30 committed by Michael Ellerman
parent 4025c784c5
commit 344717a14c
1 changed files with 8 additions and 6 deletions
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14
arch/powerpc/lib/sstep.c
View file

@ -818,13 +818,15 @@ void emulate_vsx_store(struct instruction_op *op, const union vsx_reg *reg,
break;
if (rev) {
/* reverse 32 bytes */
buf.d[0] = byterev_8(reg->d[3]);
buf.d[1] = byterev_8(reg->d[2]);
buf.d[2] = byterev_8(reg->d[1]);
buf.d[3] = byterev_8(reg->d[0]);
reg = &buf;
union vsx_reg buf32[2];
buf32[0].d[0] = byterev_8(reg[1].d[1]);
buf32[0].d[1] = byterev_8(reg[1].d[0]);
buf32[1].d[0] = byterev_8(reg[0].d[1]);
buf32[1].d[1] = byterev_8(reg[0].d[0]);
memcpy(mem, buf32, size);
} else {
memcpy(mem, reg, size);
}
memcpy(mem, reg, size);
break;
case 16:
/* stxv, stxvx, stxvl, stxvll */