4.4-stable review patch. If anyone has any objections, please let me know.
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From: Paul Moore paul@paul-moore.com
[ Upstream commit 5578de4834fe0f2a34fedc7374be691443396d1f ]
There are two array out-of-bounds memory accesses, one in cipso_v4_map_lvl_valid(), the other in netlbl_bitmap_walk(). Both errors are embarassingly simple, and the fixes are straightforward.
As a FYI for anyone backporting this patch to kernels prior to v4.8, you'll want to apply the netlbl_bitmap_walk() patch to cipso_v4_bitmap_walk() as netlbl_bitmap_walk() doesn't exist before Linux v4.8.
Reported-by: Jann Horn jannh@google.com Fixes: 446fda4f2682 ("[NetLabel]: CIPSOv4 engine") Fixes: 3faa8f982f95 ("netlabel: Move bitmap manipulation functions to the NetLabel core.") Signed-off-by: Paul Moore paul@paul-moore.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/ipv4/cipso_ipv4.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/net/ipv4/cipso_ipv4.c +++ b/net/ipv4/cipso_ipv4.c @@ -167,7 +167,8 @@ static int cipso_v4_bitmap_walk(const un (state == 0 && (byte & bitmask) == 0)) return bit_spot;
- bit_spot++; + if (++bit_spot >= bitmap_len) + return -1; bitmask >>= 1; if (bitmask == 0) { byte = bitmap[++byte_offset]; @@ -737,7 +738,8 @@ static int cipso_v4_map_lvl_valid(const case CIPSO_V4_MAP_PASS: return 0; case CIPSO_V4_MAP_TRANS: - if (doi_def->map.std->lvl.cipso[level] < CIPSO_V4_INV_LVL) + if ((level < doi_def->map.std->lvl.cipso_size) && + (doi_def->map.std->lvl.cipso[level] < CIPSO_V4_INV_LVL)) return 0; break; }