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Subject[PATCH] apparmor: secid: fix error return value in error handling path
Currently, function apparmor_secid_to_secctx returns always zero,
no matter if the value returned by aa_label_asxprint is negative
(which implies that an error has occurred).

Fix this by temporarily storing the value returned by aa_label_asxprint
into a variable of type int (signed) for its further evaluation.

Addresses-Coverity-ID: 1468514 ("Unsigned compared against 0")
Fixes: c092921219d2 ("apparmor: add support for mapping secids and using secctxes")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
security/apparmor/secid.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/security/apparmor/secid.c b/security/apparmor/secid.c
index 5029248..4b902ed 100644
--- a/security/apparmor/secid.c
+++ b/security/apparmor/secid.c
@@ -142,6 +142,7 @@ int apparmor_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
{
/* TODO: cache secctx and ref count so we don't have to recreate */
struct aa_label *label = aa_secid_to_label(secid);
+ int seclen_tmp;

AA_BUG(!secdata);
AA_BUG(!seclen);
@@ -150,17 +151,19 @@ int apparmor_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
return -EINVAL;

if (secdata)
- *seclen = aa_label_asxprint(secdata, root_ns, label,
+ seclen_tmp = aa_label_asxprint(secdata, root_ns, label,
FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
FLAG_HIDDEN_UNCONFINED |
FLAG_ABS_ROOT, GFP_ATOMIC);
else
- *seclen = aa_label_snxprint(NULL, 0, root_ns, label,
+ seclen_tmp = aa_label_snxprint(NULL, 0, root_ns, label,
FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
FLAG_HIDDEN_UNCONFINED |
FLAG_ABS_ROOT);
- if (*seclen < 0)
+ if (seclen_tmp < 0)
return -ENOMEM;
+ else
+ *seclen = seclen_tmp;

return 0;
}
--
2.7.4
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