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selinux: detect invalid ebitmap

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When count is 0 and the highbit is not zero, the ebitmap is not
valid and the internal node is not allocated. This causes issues
when routines, like mls_context_isvalid() attempt to use the
ebitmap_for_each_bit() and ebitmap_node_get_bit() as they assume
a highbit > 0 will have a node allocated.

Signed-off-by: William Roberts <william.c.roberts@intel.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
William Roberts 2016-08-23 13:49:23 -07:00 committed by Paul Moore
parent 348a0db9e6
commit 74d977b65e
1 changed files with 3 additions and 0 deletions
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security/selinux/ss/ebitmap.c
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@ -374,6 +374,9 @@ int ebitmap_read(struct ebitmap *e, void *fp)
goto ok;
}
if (e->highbit && !count)
goto bad;
for (i = 0; i < count; i++) {
rc = next_entry(&startbit, fp, sizeof(u32));
if (rc < 0) {