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-rw-r--r--lib/vsprintf.c3
-rwxr-xr-xscripts/checkpatch.pl26
2 files changed, 29 insertions, 0 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 176641cc549d..2d41de3f98a1 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1477,6 +1477,9 @@ int kptr_restrict __read_mostly;
* by an extra set of alphanumeric characters that are extended format
* specifiers.
*
+ * Please update scripts/checkpatch.pl when adding/removing conversion
+ * characters. (Search for "check for vsprintf extension").
+ *
* Right now we handle:
*
* - 'F' For symbolic function descriptor pointers with offset
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 30eeba4f1602..732bb3e2fe9a 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5663,6 +5663,32 @@ sub process {
}
}
+ # check for vsprintf extension %p<foo> misuses
+ if ($^V && $^V ge 5.10.0 &&
+ defined $stat &&
+ $stat =~ /^\+(?![^\{]*\{\s*).*\b(\w+)\s*\(.*$String\s*,/s &&
+ $1 !~ /^_*volatile_*$/) {
+ my $bad_extension = "";
+ my $lc = $stat =~ tr@\n@@;
+ $lc = $lc + $linenr;
+ for (my $count = $linenr; $count <= $lc; $count++) {
+ my $fmt = get_quoted_string($lines[$count - 1], raw_line($count, 0));
+ $fmt =~ s/%%//g;
+ if ($fmt =~ /(\%[\*\d\.]*p(?![\WFfSsBKRraEhMmIiUDdgVCbGN]).)/) {
+ $bad_extension = $1;
+ last;
+ }
+ }
+ if ($bad_extension ne "") {
+ my $stat_real = raw_line($linenr, 0);
+ for (my $count = $linenr + 1; $count <= $lc; $count++) {
+ $stat_real = $stat_real . "\n" . raw_line($count, 0);
+ }
+ WARN("VSPRINTF_POINTER_EXTENSION",
+ "Invalid vsprintf pointer extension '$bad_extension'\n" . "$here\n$stat_real\n");
+ }
+ }
+
# Check for misused memsets
if ($^V && $^V ge 5.10.0 &&
defined $stat &&

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