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powerpc/memcpy: Fix stack corruption for smaller sizes

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For sizes lesser than 128 bytes, the code branches out early without saving
the stack frame, which when restored later drops frame of the caller.

Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190903214359.23887-1-santosh@fossix.org
This commit is contained in:
Santosh Sivaraj 2019-09-04 03:13:58 +05:30 committed by Michael Ellerman
parent aa497d4352
commit 20055a8bfa
1 changed files with 1 additions and 1 deletions
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arch/powerpc/lib/memcpy_mcsafe_64.S
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@ -84,7 +84,6 @@ err1; stw r0,0(r3)
3: sub r5,r5,r6
cmpldi r5,128
blt 5f
mflr r0
stdu r1,-STACKFRAMESIZE(r1)
@ -99,6 +98,7 @@ err1; stw r0,0(r3)
std r22,STK_REG(R22)(r1)
std r0,STACKFRAMESIZE+16(r1)
blt 5f
srdi r6,r5,7
mtctr r6