diff options
Diffstat (limited to 'src/extent-scan.c')
| -rw-r--r-- | src/extent-scan.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/src/extent-scan.c b/src/extent-scan.c index 0c25c570..5d25b9aa 100644 --- a/src/extent-scan.c +++ b/src/extent-scan.c @@ -1,5 +1,5 @@ /* extent-scan.c -- core functions for scanning extents - Copyright (C) 2010-2012 Free Software Foundation, Inc. + Copyright (C) 2010-2013 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -89,7 +89,7 @@ extern bool extent_scan_read (struct extent_scan *scan) { unsigned int si = 0; - struct extent_info *last_ei IF_LINT ( = scan->ext_info); + struct extent_info *last_ei = scan->ext_info; while (true) { @@ -127,8 +127,14 @@ extent_scan_read (struct extent_scan *scan) assert (scan->ei_count <= SIZE_MAX - fiemap->fm_mapped_extents); scan->ei_count += fiemap->fm_mapped_extents; - scan->ext_info = xnrealloc (scan->ext_info, scan->ei_count, - sizeof (struct extent_info)); + { + /* last_ei points into a buffer that may be freed via xnrealloc. + Record its offset and adjust after allocation. */ + size_t prev_idx = last_ei - scan->ext_info; + scan->ext_info = xnrealloc (scan->ext_info, scan->ei_count, + sizeof (struct extent_info)); + last_ei = scan->ext_info + prev_idx; + } unsigned int i = 0; for (i = 0; i < fiemap->fm_mapped_extents; i++) |