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cp: avoid data-corrupting free-memory-read (upstream fix)

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Ondřej Vašík 2012-11-05 14:03:54 +01:00
commit f5df66531d
1 changed files with 29 additions and 0 deletions
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29
coreutils-8.17-cp-freememoryread.patch Normal file
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@ -0,0 +1,29 @@
diff -urNp coreutils-8.17-orig/src/extent-scan.c coreutils-8.17/src/extent-scan.c
--- coreutils-8.17-orig/src/extent-scan.c 2012-05-02 10:31:47.000000000 +0200
+++ coreutils-8.17/src/extent-scan.c 2012-11-05 12:05:36.732370966 +0100
@@ -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 *sc
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++)