lib/string_helpers.c: change semantics of string_escape_mem

The current semantics of string_escape_mem are inadequate for one of its
current users, vsnprintf().  If that is to honour its contract, it must
know how much space would be needed for the entire escaped buffer, and
string_escape_mem provides no way of obtaining that (short of allocating a
large enough buffer (~4 times input string) to let it play with, and
that's definitely a big no-no inside vsnprintf).

So change the semantics for string_escape_mem to be more snprintf-like:
Return the size of the output that would be generated if the destination
buffer was big enough, but of course still only write to the part of dst
it is allowed to, and (contrary to snprintf) don't do '\0'-termination.
It is then up to the caller to detect whether output was truncated and to
append a '\0' if desired.  Also, we must output partial escape sequences,
otherwise a call such as snprintf(buf, 3, "%1pE", "\123") would cause
printf to write a \0 to buf[2] but leaving buf[0] and buf[1] with whatever
they previously contained.

This also fixes a bug in the escaped_string() helper function, which used
to unconditionally pass a length of "end-buf" to string_escape_mem();
since the latter doesn't check osz for being insanely large, it would
happily write to dst.  For example, kasprintf(GFP_KERNEL, "something and
then %pE", ...); is an easy way to trigger an oops.

In test-string_helpers.c, the -ENOMEM test is replaced with testing for
getting the expected return value even if the buffer is too small.  We
also ensure that nothing is written (by relying on a NULL pointer deref)
if the output size is 0 by passing NULL - this has to work for
kasprintf("%pE") to work.

In net/sunrpc/cache.c, I think qword_add still has the same semantics.
Someone should definitely double-check this.

In fs/proc/array.c, I made the minimum possible change, but longer-term it
should stop poking around in seq_file internals.

[andriy.shevchenko@linux.intel.com: simplify qword_add]
[andriy.shevchenko@linux.intel.com: add missed curly braces]
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 42 deletions

diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index 9c48ddad0f0d..1826c7407258 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -274,11 +274,6 @@ static bool escape_space(unsigned char c, char **dst, char *end)
 		return false;
 	}
 
-	if (out + 2 > end) {
-		*dst = out + 2;
-		return true;
-	}
-
 	if (out < end)
 		*out = '\\';
 	++out;
@@ -309,11 +304,6 @@ static bool escape_special(unsigned char c, char **dst, char *end)
 		return false;
 	}
 
-	if (out + 2 > end) {
-		*dst = out + 2;
-		return true;
-	}
-
 	if (out < end)
 		*out = '\\';
 	++out;
@@ -332,11 +322,6 @@ static bool escape_null(unsigned char c, char **dst, char *end)
 	if (c)
 		return false;
 
-	if (out + 2 > end) {
-		*dst = out + 2;
-		return true;
-	}
-
 	if (out < end)
 		*out = '\\';
 	++out;
@@ -352,11 +337,6 @@ static bool escape_octal(unsigned char c, char **dst, char *end)
 {
 	char *out = *dst;
 
-	if (out + 4 > end) {
-		*dst = out + 4;
-		return true;
-	}
-
 	if (out < end)
 		*out = '\\';
 	++out;
@@ -378,11 +358,6 @@ static bool escape_hex(unsigned char c, char **dst, char *end)
 {
 	char *out = *dst;
 
-	if (out + 4 > end) {
-		*dst = out + 4;
-		return true;
-	}
-
 	if (out < end)
 		*out = '\\';
 	++out;
@@ -449,20 +424,17 @@ static bool escape_hex(unsigned char c, char **dst, char *end)
  * it if needs.
  *
  * Return:
- * The amount of the characters processed to the destination buffer, or
- * %-ENOMEM if the size of buffer is not enough to put an escaped character is
- * returned.
- *
- * Even in the case of error @dst pointer will be updated to point to the byte
- * after the last processed character.
+ * The total size of the escaped output that would be generated for
+ * the given input and flags. To check whether the output was
+ * truncated, compare the return value to osz. There is room left in
+ * dst for a '\0' terminator if and only if ret < osz.
  */
-int string_escape_mem(const char *src, size_t isz, char **dst, size_t osz,
+int string_escape_mem(const char *src, size_t isz, char *dst, size_t osz,
 		      unsigned int flags, const char *esc)
 {
-	char *p = *dst;
+	char *p = dst;
 	char *end = p + osz;
 	bool is_dict = esc && *esc;
-	int ret;
 
 	while (isz--) {
 		unsigned char c = *src++;
@@ -502,13 +474,6 @@ int string_escape_mem(const char *src, size_t isz, char **dst, size_t osz,
 		escape_passthrough(c, &p, end);
 	}
 
-	if (p > end) {
-		*dst = end;
-		return -ENOMEM;
-	}
-
-	ret = p - *dst;
-	*dst = p;
-	return ret;
+	return p - dst;
 }
 EXPORT_SYMBOL(string_escape_mem);