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apparmor: Fully initialize aa_perms struct when answering userspace query

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Fully initialize the aa_perms struct in profile_query_cb() to avoid the
potential of using an uninitialized struct member's value in a response
to a query from userspace.

Detected by CoverityScan CID#1415126 ("Uninitialized scalar variable")

Fixes: 4f3b3f2d79 ("apparmor: add profile permission query ability")
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
Tyler Hicks 2018-07-06 05:25:01 +00:00 committed by John Johansen
parent 7f3ebcf2b1
commit f4585bc20f
1 changed files with 1 additions and 4 deletions
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5
security/apparmor/apparmorfs.c
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@ -603,7 +603,7 @@ static const struct file_operations aa_fs_ns_revision_fops = {
static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms, static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
const char *match_str, size_t match_len) const char *match_str, size_t match_len)
{ {
struct aa_perms tmp; struct aa_perms tmp = { };
struct aa_dfa *dfa; struct aa_dfa *dfa;
unsigned int state = 0; unsigned int state = 0;
@ -613,7 +613,6 @@ static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
dfa = profile->file.dfa; dfa = profile->file.dfa;
state = aa_dfa_match_len(dfa, profile->file.start, state = aa_dfa_match_len(dfa, profile->file.start,
match_str + 1, match_len - 1); match_str + 1, match_len - 1);
tmp = nullperms;
if (state) { if (state) {
struct path_cond cond = { }; struct path_cond cond = { };
@ -627,8 +626,6 @@ static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
match_str, match_len); match_str, match_len);
if (state) if (state)
aa_compute_perms(dfa, state, &tmp); aa_compute_perms(dfa, state, &tmp);
else
tmp = nullperms;
} }
aa_apply_modes_to_perms(profile, &tmp); aa_apply_modes_to_perms(profile, &tmp);
aa_perms_accum_raw(perms, &tmp); aa_perms_accum_raw(perms, &tmp);