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+To: vim-dev@vim.org
+Subject: Patch 7.2.307
+Fcc: outbox
+From: Bram Moolenaar <Bram@moolenaar.net>
+Mime-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+------------
+
+Patch 7.2.307
+Problem: Crash with a very long syntax match statement. (Guy Gur Ari)
+Solution: When the offset does not fit in the two bytes available give an
+ error instead of continuing with invalid pointers.
+Files: src/regexp.c
+
+
+*** ../vim-7.2.306/src/regexp.c 2009-05-15 21:31:11.000000000 +0200
+--- src/regexp.c 2009-11-25 18:13:03.000000000 +0100
+***************
+*** 583,588 ****
+--- 583,589 ----
+ #endif
+ static char_u *regcode; /* Code-emit pointer, or JUST_CALC_SIZE */
+ static long regsize; /* Code size. */
++ static int reg_toolong; /* TRUE when offset out of range */
+ static char_u had_endbrace[NSUBEXP]; /* flags, TRUE if end of () found */
+ static unsigned regflags; /* RF_ flags for prog */
+ static long brace_min[10]; /* Minimums for complex brace repeats */
+***************
+*** 1028,1036 ****
+ regcomp_start(expr, re_flags);
+ regcode = r->program;
+ regc(REGMAGIC);
+! if (reg(REG_NOPAREN, &flags) == NULL)
+ {
+ vim_free(r);
+ return NULL;
+ }
+
+--- 1029,1039 ----
+ regcomp_start(expr, re_flags);
+ regcode = r->program;
+ regc(REGMAGIC);
+! if (reg(REG_NOPAREN, &flags) == NULL || reg_toolong)
+ {
+ vim_free(r);
++ if (reg_toolong)
++ EMSG_RET_NULL(_("E339: Pattern too long"));
+ return NULL;
+ }
+
+***************
+*** 1141,1146 ****
+--- 1144,1150 ----
+ re_has_z = 0;
+ #endif
+ regsize = 0L;
++ reg_toolong = FALSE;
+ regflags = 0;
+ #if defined(FEAT_SYN_HL) || defined(PROTO)
+ had_eol = FALSE;
+***************
+*** 1228,1234 ****
+ {
+ skipchr();
+ br = regbranch(&flags);
+! if (br == NULL)
+ return NULL;
+ regtail(ret, br); /* BRANCH -> BRANCH. */
+ if (!(flags & HASWIDTH))
+--- 1232,1238 ----
+ {
+ skipchr();
+ br = regbranch(&flags);
+! if (br == NULL || reg_toolong)
+ return NULL;
+ regtail(ret, br); /* BRANCH -> BRANCH. */
+ if (!(flags & HASWIDTH))
+***************
+*** 1313,1318 ****
+--- 1317,1324 ----
+ break;
+ skipchr();
+ regtail(latest, regnode(END)); /* operand ends */
++ if (reg_toolong)
++ break;
+ reginsert(MATCH, latest);
+ chain = latest;
+ }
+***************
+*** 1382,1388 ****
+ break;
+ default:
+ latest = regpiece(&flags);
+! if (latest == NULL)
+ return NULL;
+ *flagp |= flags & (HASWIDTH | HASNL | HASLOOKBH);
+ if (chain == NULL) /* First piece. */
+--- 1388,1394 ----
+ break;
+ default:
+ latest = regpiece(&flags);
+! if (latest == NULL || reg_toolong)
+ return NULL;
+ *flagp |= flags & (HASWIDTH | HASNL | HASLOOKBH);
+ if (chain == NULL) /* First piece. */
+***************
+*** 2540,2547 ****
+ offset = (int)(scan - val);
+ else
+ offset = (int)(val - scan);
+! *(scan + 1) = (char_u) (((unsigned)offset >> 8) & 0377);
+! *(scan + 2) = (char_u) (offset & 0377);
+ }
+
+ /*
+--- 2546,2561 ----
+ offset = (int)(scan - val);
+ else
+ offset = (int)(val - scan);
+! /* When the offset uses more than 16 bits it can no longer fit in the two
+! * bytes avaliable. Use a global flag to avoid having to check return
+! * values in too many places. */
+! if (offset > 0xffff)
+! reg_toolong = TRUE;
+! else
+! {
+! *(scan + 1) = (char_u) (((unsigned)offset >> 8) & 0377);
+! *(scan + 2) = (char_u) (offset & 0377);
+! }
+ }
+
+ /*
+***************
+*** 5764,5769 ****
+--- 5778,5785 ----
+
+ /*
+ * regnext - dig the "next" pointer out of a node
++ * Returns NULL when calculating size, when there is no next item and when
++ * there is an error.
+ */
+ static char_u *
+ regnext(p)
+***************
+*** 5771,5777 ****
+ {
+ int offset;
+
+! if (p == JUST_CALC_SIZE)
+ return NULL;
+
+ offset = NEXT(p);
+--- 5787,5793 ----
+ {
+ int offset;
+
+! if (p == JUST_CALC_SIZE || reg_toolong)
+ return NULL;
+
+ offset = NEXT(p);
+*** ../vim-7.2.306/src/version.c 2009-11-25 17:15:16.000000000 +0100
+--- src/version.c 2009-11-25 18:14:32.000000000 +0100
+***************
+*** 683,684 ****
+--- 683,686 ----
+ { /* Add new patch number below this line */
++ /**/
++ 307,
+ /**/
+
+--
+The fastest way to get an engineer to solve a problem is to declare that the
+problem is unsolvable. No engineer can walk away from an unsolvable problem
+until it's solved.
+ (Scott Adams - The Dilbert principle)
+
+ /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net \\\
+/// sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
+\\\ download, build and distribute -- http://www.A-A-P.org ///
+ \\\ help me help AIDS victims -- http://ICCF-Holland.org ///