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authorJerome Marchand <jmarchan@redhat.com>2010-09-09 16:37:59 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-09-09 18:57:24 -0700
commit1c24de60e50fb19b94d94225458da17c720f0729 (patch)
treea225907a1b341f629037805f086add137e176f4a /kernel
parent94131e174fedd9f3f9bb148cee4be12f2d46d68e (diff)
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kernel/groups.c: fix integer overflow in groups_search
gid_t is a unsigned int. If group_info contains a gid greater than MAX_INT, groups_search() function may look on the wrong side of the search tree. This solves some unfair "permission denied" problems. Signed-off-by: Jerome Marchand <jmarchan@redhat.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/groups.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/groups.c b/kernel/groups.c
index 53b1916c949..253dc0f35cf 100644
--- a/kernel/groups.c
+++ b/kernel/groups.c
@@ -143,10 +143,9 @@ int groups_search(const struct group_info *group_info, gid_t grp)
right = group_info->ngroups;
while (left < right) {
unsigned int mid = (left+right)/2;
- int cmp = grp - GROUP_AT(group_info, mid);
- if (cmp > 0)
+ if (grp > GROUP_AT(group_info, mid))
left = mid + 1;
- else if (cmp < 0)
+ else if (grp < GROUP_AT(group_info, mid))
right = mid;
else
return 1;