mangle_path accepts a string listing the characters it's supposed to escape. Some, but not all, callers put backslash in this set. Shouldn't we be escaping '\' regardless, since it's the character used to signal all other escapes?
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 555f821..02dcd5c 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -443,7 +443,7 @@ char *mangle_path(char *s, const char *p, const char
*esc)
char c = *p++;
if (!c) {
return s;
- } else if (!strchr(esc, c)) {
+ } else if (s != '\\' && !strchr(esc, c)) {
*s++ = c;
} else if (s + 4 > p) {
break;
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