File CVE-2018-1083.patch of Package zsh.7007

commit 259ac472eac291c8c103c7a0d8a4eaf3c2942ed7
Author: Oliver Kiddle <okiddle@yahoo.co.uk>
Date:   Sat Mar 24 15:04:39 2018 +0100

    42519, CVE-2018-1083: check bounds on PATH_MAX-sized buffer used for file completion candidates

commit 259ac472eac291c8c103c7a0d8a4eaf3c2942ed7
Author: Oliver Kiddle <okiddle@yahoo.co.uk>
Date:   Sat Mar 24 15:04:39 2018 +0100

    42519, CVE-2018-1083: check bounds on PATH_MAX-sized buffer used for file completion candidates

Index: zsh-5.0.5/Src/Zle/compctl.c
===================================================================
--- zsh-5.0.5.orig/Src/Zle/compctl.c
+++ zsh-5.0.5/Src/Zle/compctl.c
@@ -2156,6 +2156,8 @@ gen_matches_files(int dirs, int execs, i
     if (prpre && *prpre) {
 	pathpref = dupstring(prpre);
 	unmetafy(pathpref, &pathpreflen);
+	if (pathpreflen > PATH_MAX)
+	    return;
 	/* system needs NULL termination, not provided by unmetafy */
 	pathpref[pathpreflen] = '\0';
     } else {
@@ -2198,6 +2200,8 @@ gen_matches_files(int dirs, int execs, i
 		     * the path buffer by appending the filename.       */
 		    ums = dupstring(n);
 		    unmetafy(ums, &umlen);
+		    if (umlen + pathpreflen + 1 > PATH_MAX)
+			continue;
 		    memcpy(q, ums, umlen);
 		    q[umlen] = '\0';
 		    /* And do the stat. */
@@ -2212,6 +2216,8 @@ gen_matches_files(int dirs, int execs, i
 			/* We have to test for a path suffix. */
 			int o = strlen(p), tt;
 
+			if (o + strlen(psuf) > PATH_MAX)
+			    continue;
 			/* Append it to the path buffer. */
 			strcpy(p + o, psuf);