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[ARM] Fix csumpartial corner case

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

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2005-11-10 11:40:53 +00:00
committed by Russell King
parent 3b44f137b9
commit af36bef0c5
1 changed files with 4 additions and 0 deletions
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4
arch/arm/lib/csumpartial.S
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@@ -39,6 +39,7 @@ td3 .req lr
/* we must have at least one byte. */ /* we must have at least one byte. */
tst buf, #1 @ odd address? tst buf, #1 @ odd address?
movne sum, sum, ror #8
ldrneb td0, [buf], #1 ldrneb td0, [buf], #1
subne len, len, #1 subne len, len, #1
adcnes sum, sum, td0, put_byte_1 adcnes sum, sum, td0, put_byte_1
@@ -103,6 +104,9 @@ ENTRY(csum_partial)
cmp len, #8 @ Ensure that we have at least cmp len, #8 @ Ensure that we have at least
blo .less8 @ 8 bytes to copy. blo .less8 @ 8 bytes to copy.
tst buf, #1
movne sum, sum, ror #8
adds sum, sum, #0 @ C = 0 adds sum, sum, #0 @ C = 0
tst buf, #3 @ Test destination alignment tst buf, #3 @ Test destination alignment
blne .not_aligned @ aligh destination, return here blne .not_aligned @ aligh destination, return here