Fix <https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9169>.

Taken from this upstream commit, sans ChangeLog updates:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=583dd860d5b833037175247230a328f0050dbfe9

diff --git a/posix/regexec.c b/posix/regexec.c
index 91d5a797b8..084b1222d9 100644
--- a/posix/regexec.c
+++ b/posix/regexec.c
@@ -1293,8 +1293,10 @@ proceed_next_node (const re_match_context_t *mctx, Idx nregs, regmatch_t *regs,
 	      else if (naccepted)
 		{
 		  char *buf = (char *) re_string_get_buffer (&mctx->input);
-		  if (memcmp (buf + regs[subexp_idx].rm_so, buf + *pidx,
-			      naccepted) != 0)
+		  if (mctx->input.valid_len - *pidx < naccepted
+		      || (memcmp (buf + regs[subexp_idx].rm_so, buf + *pidx,
+				  naccepted)
+			  != 0))
 		    return -1;
 		}
 	    }
ted='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=bfcfe53c72f04e825f33269258c5ebbc33b70131'>refs</a><a class='active' href='/guix/log/gnu/packages/kde-pim.scm?showmsg=1'>log</a><a href='/guix/tree/gnu/packages/kde-pim.scm?id=bfcfe53c72f04e825f33269258c5ebbc33b70131'>tree</a><a href='/guix/commit/gnu/packages/kde-pim.scm?id=bfcfe53c72f04e825f33269258c5ebbc33b70131'>commit</a><a href='/guix/diff/gnu/packages/kde-pim.scm?id=bfcfe53c72f04e825f33269258c5ebbc33b70131'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/kde-pim.scm'>
<input type='hidden' name='id' value='bfcfe53c72f04e825f33269258c5ebbc33b70131'/><input type='hidden' name='showmsg' value='1'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=bfcfe53c72f04e825f33269258c5ebbc33b70131&amp;showmsg=1'>root</a>/<a href='/guix/log/gnu?id=bfcfe53c72f04e825f33269258c5ebbc33b70131&amp;showmsg=1'>gnu</a>/<a href='/guix/log/gnu/packages?id=bfcfe53c72f04e825f33269258c5ebbc33b70131&amp;showmsg=1'>packages</a>/<a href='/guix/log/gnu/packages/kde-pim.scm?id=bfcfe53c72f04e825f33269258c5ebbc33b70131&amp;showmsg=1'>kde-pim.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/kde-pim.scm?id=bfcfe53c72f04e825f33269258c5ebbc33b70131'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2023-03-31 14:20:28 +0200'>2023-03-31</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/kde-pim.scm?id=7f7532a847f1232fa8797a5d6d6b2a7e34278854'>gnu: Remove gpgme-1.18 and qgpgme-1.18.</a></td><td>Josselin Poiret</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/gnupg.scm (gpgme-1.18, qgpgme-1.18): Remove variables.
* gnu/packages/kde-pim.sm (kleopatra, kmail): Refer to gpgme and qgpgme instead.

Signed-off-by: Guillaume Le Vaillant &lt;glv@posteo.net&gt;


</td></tr>