res_fax: Fix out of bounds error in update_modem_bits().

ASTERISK-24357 #close
Reported by: Jeremy Laine
Patches:
      res_fax_bounds.patch (license #6561) patch uploaded by Jeremy Laine
	  Modified patch to not use magic numbers.
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Merged revisions 423979 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 423983 from http://svn.asterisk.org/svn/asterisk/branches/11

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/12@423987 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/res/res_fax.c b/res/res_fax.c
index d1eb71983db31c9426b384a0e295a6f969f3dd10..82e874703bcba1a018fb65c2d88edbbcc27e7329 100644 (file)
--- a/res/res_fax.c
+++ b/res/res_fax.c
@@ -625,7 +625,7 @@ static int update_modem_bits(enum ast_fax_modems *bits, const char *value)
                m[i] = NULL;
        } else {
                tok = strtok(v, ", ");
-               while (tok && (i < 5)) {
+               while (tok && i < ARRAY_LEN(m) - 1) {
                        m[i++] = tok;
                        tok = strtok(NULL, ", ");
                }