[PATCH v1 1/2] lib: Fix potential invalid read past an empty string

diff --git a/de/c7f5d79d721753a1c0c1e94b7db92eb49084f8 b/de/c7f5d79d721753a1c0c1e94b7db92eb49084f8
new file mode 100644 (file)
index 0000000..46d5b36
--- /dev/null
+++ b/de/c7f5d79d721753a1c0c1e94b7db92eb49084f8
@@ -0,0 +1,94 @@
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+From: Todd <todd@electricoding.com>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH v1 1/2] lib: Fix potential invalid read past an empty string\r
+Date: Sat, 17 Jan 2015 09:51:45 -0600\r
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+\r
+==22884== ERROR: AddressSanitizer: heap-buffer-overflow on address 0x601600008291 at pc 0x7ff6295680e5 bp 0x7fff4ab9aa40 sp 0x7fff4ab9aa08\r
+READ of size 1 at 0x601600008291 thread T0\r
+    #0 0x7ff6295680e4 in __interceptor_strcmp ??:?\r
+    #1 0x44763b in _thread_add_message /home/todd/.apps/notmuch/lib/thread.cc:255\r
+    #2 0x4459e8 in notmuch_threads_get /home/todd/.apps/notmuch/lib/query.cc:496\r
+    #3 0x41e2a7 in do_search_threads /home/todd/.apps/notmuch/notmuch-search.c:131\r
+    #4 0x40a408 in main /home/todd/.apps/notmuch/notmuch.c:345\r
+    #5 0x7ff627cb9ec4 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287\r
+    #6 0x40abf3 in _start ??:?\r
+0x601600008291 is located 0 bytes to the right of 97-byte region [0x601600008230,0x601600008291)\r
+allocated by thread T0 here:\r
+    #0 0x7ff62956e41a in malloc ??:?\r
+    #1 0x7ff628b8ab5d in talloc_strdup ??:?\r
+---\r
+ lib/thread.cc | 4 ++--\r
+ 1 file changed, 2 insertions(+), 2 deletions(-)\r
+\r
+diff --git a/lib/thread.cc b/lib/thread.cc\r
+index 4542505..4c49f98 100644\r
+--- a/lib/thread.cc\r
++++ b/lib/thread.cc\r
+@@ -251,8 +251,8 @@ _thread_add_message (notmuch_thread_t *thread,\r
+                term != NULL;\r
+                term = term->next)\r
+           {\r
+-              /* We ignore initial 'K'. */\r
+-              if (strcmp(tag, (term->string + 1)) == 0) {\r
++              /* Check for an empty string, and then ignore initial 'K'. */\r
++              if (*(term->string) && strcmp(tag, (term->string + 1)) == 0) {\r
+                   message_excluded = TRUE;\r
+                   break;\r
+               }\r
+-- \r
+1.9.1\r
+\r