Fix crash on compiling a regular expression with more than 32k colors.

Throw an error instead.

Backpatch to all supported branches.

diff --git a/src/backend/regex/regc_color.c b/src/backend/regex/regc_color.c
index 1c60566fbf57458a1f43a4116432e0636ebcd92d..e6aa899518fc36beb3f6a9ca78fe161958b4cfcc 100644 (file)
--- a/src/backend/regex/regc_color.c
+++ b/src/backend/regex/regc_color.c
@@ -247,7 +247,15 @@ newcolor(struct colormap * cm)
        /* oops, must allocate more */
        struct colordesc *newCd;
 
+       if (cm->max == MAX_COLOR)
+       {
+           CERR(REG_ECOLORS);
+           return COLORLESS;   /* too many colors */
+       }
+
        n = cm->ncds * 2;
+       if (n > MAX_COLOR + 1)
+           n = MAX_COLOR + 1;
        if (cm->cd == cm->cdspace)
        {
            newCd = (struct colordesc *) MALLOC(n * sizeof(struct colordesc));

diff --git a/src/include/regex/regerrs.h b/src/include/regex/regerrs.h
index a761371e5d716a15e1cf112b2403d47327b749de..f02711ee1762604dee60ce2b99a3858dded91ccf 100644 (file)
--- a/src/include/regex/regerrs.h
+++ b/src/include/regex/regerrs.h
@@ -77,3 +77,7 @@
 {
    REG_ETOOBIG, "REG_ETOOBIG", "nfa has too many states"
 },
+
+{
+   REG_ECOLORS, "REG_ECOLORS", "too many colors"
+},

diff --git a/src/include/regex/regex.h b/src/include/regex/regex.h
index 616c2c6450d80443361ca7e4660f52aaa266c9ad..3e87dff17b27f6c622a9e9278a64ea7a2bc8abad 100644 (file)
--- a/src/include/regex/regex.h
+++ b/src/include/regex/regex.h
@@ -153,6 +153,7 @@ typedef struct
 #define REG_MIXED  17          /* character widths of regex and string differ */
 #define REG_BADOPT 18          /* invalid embedded option */
 #define REG_ETOOBIG 19         /* nfa has too many states */
+#define REG_ECOLORS 20         /* too many colors */
 /* two specials for debugging and testing */
 #define REG_ATOI   101         /* convert error-code name to number */
 #define REG_ITOA   102         /* convert error-code number to name */

diff --git a/src/include/regex/regguts.h b/src/include/regex/regguts.h
index e1e406f4eaa77720d88938cf150348ce903f88d8..4e04abfa6f295ea235eeb8cbae61d1e9240ecde0 100644 (file)
--- a/src/include/regex/regguts.h
+++ b/src/include/regex/regguts.h
@@ -148,6 +148,7 @@
 typedef short color;           /* colors of characters */
 typedef int pcolor;                /* what color promotes to */
 
+#define MAX_COLOR  32767       /* max color (must fit in 'color' datatype) */
 #define COLORLESS  (-1)        /* impossible color */
 #define WHITE      0           /* default color, parent of all others */