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authorPaul Moore <paul@paul-moore.com>2019-02-25 19:06:06 -0500
committerDavid S. Miller <davem@davemloft.net>2019-02-27 21:45:24 -0800
commit5578de4834fe0f2a34fedc7374be691443396d1f (patch)
tree57b5851e93a59389e6a1bb0cfaee81d1c586ba5f /net/netlabel
parenta1fd1ad2552fad9e649eeb85fd79301e2880a886 (diff)
downloadlinux-5578de4834fe0f2a34fedc7374be691443396d1f.tar.bz2
netlabel: fix out-of-bounds memory accesses
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>
Diffstat (limited to 'net/netlabel')
-rw-r--r--net/netlabel/netlabel_kapi.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
index ea7c67050792..ee3e5b6471a6 100644
--- a/net/netlabel/netlabel_kapi.c
+++ b/net/netlabel/netlabel_kapi.c
@@ -903,7 +903,8 @@ int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len,
(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];