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powerpc/memcpy: Fix stack corruption for smaller sizes 

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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2
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 3: sub r5,r5,r6
cmpldi r5,128 cmpldi r5,128
blt 5f
mflr r0 mflr r0
stdu r1,-STACKFRAMESIZE(r1) stdu r1,-STACKFRAMESIZE(r1)
@ -99,6 +98,7 @@ err1; stw r0,0(r3)
std r22,STK_REG(R22)(r1) std r22,STK_REG(R22)(r1)
std r0,STACKFRAMESIZE+16(r1) std r0,STACKFRAMESIZE+16(r1)
blt 5f
srdi r6,r5,7 srdi r6,r5,7
mtctr r6 mtctr r6