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dtc: Avoid UB when shifting

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Prevent undefined behavior when shifting by a number that's bigger than
or equal to the width of the first operand.

Signed-off-by: Andrei Ziureaev <andrei.ziureaev@arm.com>
Message-Id: <20200714154542.18064-2-andrei.ziureaev@arm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Andrei Ziureaev 2020-07-14 16:45:37 +01:00 committed by David Gibson
parent 3e3138b4a9
commit 808cdaaf52
1 changed files with 2 additions and 2 deletions
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4
dtc-parser.y
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@ -476,8 +476,8 @@ integer_rela:
;
integer_shift:
integer_shift DT_LSHIFT integer_add { $$ = $1 << $3; }
| integer_shift DT_RSHIFT integer_add { $$ = $1 >> $3; }
integer_shift DT_LSHIFT integer_add { $$ = ($3 < 64) ? ($1 << $3) : 0; }
| integer_shift DT_RSHIFT integer_add { $$ = ($3 < 64) ? ($1 >> $3) : 0; }
| integer_add
;