glibc/glibc-rh1784525.patch

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commit ef21bd2d8c6805c0c186a01f7c5039189f51b8c4
Author: DJ Delorie <dj@redhat.com>
Date: Fri Oct 18 17:15:52 2019 -0400
loadarchive: guard against locale-archive corruption (Bug #25115)
_nl_load_locale_from_archive() checks for a zero size, but
divides by both (size) and (size-2). Extend the check to
guard against a size of two or less.
Tested by manually corrupting locale-archive and running a program
that calls setlocale() with LOCPATH unset (size is typically very
large).
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
diff --git a/locale/loadarchive.c b/locale/loadarchive.c
index 516d30d8d16bd578..b308fd886f44e1fd 100644
--- a/locale/loadarchive.c
+++ b/locale/loadarchive.c
@@ -274,7 +274,7 @@ _nl_load_locale_from_archive (int category, const char **namep)
+ head->namehash_offset);
/* Avoid division by 0 if the file is corrupted. */
- if (__glibc_unlikely (head->namehash_size == 0))
+ if (__glibc_unlikely (head->namehash_size <= 2))
goto close_and_out;
idx = hval % head->namehash_size;