linux-kernel - [PATCH] scripts/decode_stacktrace: Match basepath using shell prefix operator, not regex

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Message-Id: <20190518055946.181563-1-drinkcat@chromium.org>
Date:   Sat, 18 May 2019 13:59:46 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] scripts/decode_stacktrace: Match basepath using shell prefix operator, not regex

The basepath may contain special characters, which would confuse
the regex matcher. ${var#prefix} does the right thing.

Fixes: 67a28de47faa8358 ("scripts/decode_stacktrace: only strip base path when a prefix of the path")
Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>
Reviewed-by: Stephen Boyd <swboyd@...omium.org>
---

I'm not sure how people normally use this script, but this seems to break
even with a simple full path as parameter (e.g. /home/.../kernel/).

 scripts/decode_stacktrace.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/decode_stacktrace.sh b/scripts/decode_stacktrace.sh
index bcdd45df3f5127a..e042acedcc0332c 100755
--- a/scripts/decode_stacktrace.sh
+++ b/scripts/decode_stacktrace.sh
@@ -85,7 +85,7 @@ parse_symbol() {
 	fi
 
 	# Strip out the base of the path
-	code=${code//^$basepath/""}
+	code=${code#$basepath/}
 
 	# In the case of inlines, move everything to same line
 	code=${code//$'\n'/' '}
-- 
2.21.0.1020.gf2820cf01a-goog