scripts/decode_stacktrace: match basepath using shell prefix operator, not regex

[ Upstream commit 31013836a71e07751a6827f9d2ad41ef502ddaff ]

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

Link: http://lkml.kernel.org/r/20190518055946.181563-1-drinkcat@chromium.org
Fixes: 67a28de47faa8358 ("scripts/decode_stacktrace: only strip base path when a prefix of the path")
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/scripts/decode_stacktrace.sh b/scripts/decode_stacktrace.sh
index ffc46c7..4f5e76f 100755 (executable)
--- a/scripts/decode_stacktrace.sh
+++ b/scripts/decode_stacktrace.sh
@@ -64,7 +64,7 @@ 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'/' '}