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Commit af36bef0 authored by Russell King's avatar Russell King Committed by Russell King
Browse files

[ARM] Fix csumpartial corner case 



Ji-In Park discovered a bug in csumpartial which caused wrong
checksums with misaligned buffers.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 3b44f137

arch/arm/lib/csumpartial.S

+4 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ td3 .req lr 


		/* we must have at least one byte. */

		tst	buf, #1			@ odd address?

		movne	sum, sum, ror #8

		ldrneb	td0, [buf], #1

		subne	len, len, #1

		adcnes	sum, sum, td0, put_byte_1
@@ -103,6 +104,9 @@ ENTRY(csum_partial) 
		cmp	len, #8			@ Ensure that we have at least

		blo	.less8			@ 8 bytes to copy.



		tst	buf, #1

		movne	sum, sum, ror #8



		adds	sum, sum, #0		@ C = 0

		tst	buf, #3			@ Test destination alignment

		blne	.not_aligned		@ aligh destination, return here