svn commit: r356569 - head/lib/libc/locale

[Mark Johnston]

Author: markj
Date: Thu Jan  9 20:49:26 2020
New Revision: 356569
URL: https://svnweb.freebsd.org/changeset/base/356569

Log:
  libc: Fix a few bugs in the xlocale collation code.
  
  - Fix checks for mmap() failures. [1]
  - Set the "map" and "maplen" fields of struct xlocale_collate so that
    the table destructor actually does something.
  - Free an already-mapped collation file before loading a new one into
    the global table.
  - Harmonize the prototype and definition of __collate_load_tables_l() by
    adding the "static" qualifier to the latter.
  
  PR:           243195
  Reported by:  cem [1]
  Reviewed by:  cem, yuripv
  MFC after:    1 week
  Sponsored by: The FreeBSD Foundation
  Differential Revision:        https://reviews.freebsd.org/D23109

Modified:
  head/lib/libc/locale/collate.c
  head/lib/libc/locale/rune.c

Modified: head/lib/libc/locale/collate.c
==============================================================================
--- head/lib/libc/locale/collate.c      Thu Jan  9 20:45:01 2020        
(r356568)
+++ head/lib/libc/locale/collate.c      Thu Jan  9 20:49:26 2020        
(r356569)
@@ -109,7 +109,7 @@ __collate_load_tables(const char *encoding)
        return (__collate_load_tables_l(encoding, &__xlocale_global_collate));
 }
 
-int
+static int
 __collate_load_tables_l(const char *encoding, struct xlocale_collate *table)
 {
        int i, chains, z;
@@ -147,7 +147,7 @@ __collate_load_tables_l(const char *encoding, struct x
        }
        map = mmap(NULL, sbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
        (void) _close(fd);
-       if ((TMP = map) == NULL) {
+       if ((TMP = map) == MAP_FAILED) {
                return (_LDP_ERROR);
        }
 
@@ -181,6 +181,11 @@ __collate_load_tables_l(const char *encoding, struct x
                return (_LDP_ERROR);
        }
 
+       if (table->map && (table->maplen > 0)) {
+               (void) munmap(table->map, table->maplen);
+       }
+       table->map = map;
+       table->maplen = sbuf.st_size;
        table->info = info;
        table->char_pri_table = (void *)TMP;
        TMP += sizeof (collate_char_t) * (UCHAR_MAX + 1);

Modified: head/lib/libc/locale/rune.c
==============================================================================
--- head/lib/libc/locale/rune.c Thu Jan  9 20:45:01 2020        (r356568)
+++ head/lib/libc/locale/rune.c Thu Jan  9 20:49:26 2020        (r356569)
@@ -94,7 +94,7 @@ _Read_RuneMagi(const char *fname)
 
        fdata = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
        (void) _close(fd);
-       if (fdata == NULL) {
+       if (fdata == MAP_FAILED) {
                errno = EINVAL;
                return (NULL);
        }
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