[PATCH] sprinters: bugfix when NULL passed for a string.
Mark Walters
markwalters1009 at gmail.com
Tue Aug 7 12:48:52 PDT 2012
The string function in a sprinter may be called with a NULL string
pointer (eg if a header is absent). This causes a segfault. We fix
this by checking for a null pointer in the string functions and update
the sprinter documentation.
At the moment some output when format=text is done directly rather than
via an sprinter: in that case a null pointer is passed to printf or
similar and a "(null)" appears in the output. That behaviour is not
changed in this patch.
---
This could really do with some tests (it is the second time this type of
bug has occurred). To be considered as a message by notmuch new a file
needs at least one of a From: Subject: or To: header. Thus we should
have three messages each of which just contains that single header (and
nothing else) and check that search and show work as expected.
sprinter-json.c | 2 ++
sprinter-text.c | 2 ++
sprinter.h | 4 +++-
3 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/sprinter-json.c b/sprinter-json.c
index c9b6835..0a07790 100644
--- a/sprinter-json.c
+++ b/sprinter-json.c
@@ -118,6 +118,8 @@ json_string_len (struct sprinter *sp, const char *val, size_t len)
static void
json_string (struct sprinter *sp, const char *val)
{
+ if (val == NULL)
+ val = "";
json_string_len (sp, val, strlen (val));
}
diff --git a/sprinter-text.c b/sprinter-text.c
index dfa54b5..10343be 100644
--- a/sprinter-text.c
+++ b/sprinter-text.c
@@ -38,6 +38,8 @@ text_string_len (struct sprinter *sp, const char *val, size_t len)
static void
text_string (struct sprinter *sp, const char *val)
{
+ if (val == NULL)
+ val = "";
text_string_len (sp, val, strlen (val));
}
diff --git a/sprinter.h b/sprinter.h
index 5f43175..912a526 100644
--- a/sprinter.h
+++ b/sprinter.h
@@ -27,7 +27,9 @@ typedef struct sprinter {
* a list or map, followed or preceded by separators). For string
* and string_len, the char * must be UTF-8 encoded. string_len
* allows non-terminated strings and strings with embedded NULs
- * (though the handling of the latter is format-dependent).
+ * (though the handling of the latter is format-dependent). For
+ * string (but not string_len) the string pointer passed may be
+ * NULL.
*/
void (*string) (struct sprinter *, const char *);
void (*string_len) (struct sprinter *, const char *, size_t);
--
1.7.9.1
H
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