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SUSE:SLE-12-SP5:GA
libxkbcommon
xkbcomp-fix-stack-overflow-when-evaluating-bool...
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File xkbcomp-fix-stack-overflow-when-evaluating-boolean-n.patch of Package libxkbcommon
From 1f9d1248c07cda8aaff762429c0dce146de8632a Mon Sep 17 00:00:00 2001 From: Ran Benita <ran234@gmail.com> Date: Sat, 10 Mar 2018 23:10:47 +0200 Subject: [PATCH] xkbcomp: fix stack overflow when evaluating boolean negation Git-commit: 1f9d1248c07cda8aaff762429c0dce146de8632a Patch-mainline: xkbcommon-0.8.1 References: CVE-2018-15853 The expression evaluator would go into an infinite recursion when evaluating something like this as a boolean: `!True`. Instead of recursing to just `True` and negating, it recursed to `!True` itself again. Bug inherited from xkbcomp. Caught with the afl fuzzer. Signed-off-by: Ran Benita <ran234@gmail.com> --- src/xkbcomp/expr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/xkbcomp/expr.c b/src/xkbcomp/expr.c index 3ff3c18..5d43cba 100644 --- a/src/xkbcomp/expr.c +++ b/src/xkbcomp/expr.c @@ -165,7 +165,7 @@ ExprResolveBoolean(struct xkb_context *ctx, const ExprDef *expr, case EXPR_INVERT: case EXPR_NOT: - ok = ExprResolveBoolean(ctx, expr, set_rtrn); + ok = ExprResolveBoolean(ctx, expr->unary.child, set_rtrn); if (ok) *set_rtrn = !*set_rtrn; return ok; -- 2.35.3
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