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authorJerome Marchand <jmarchan@redhat.com>2010-09-09 19:37:59 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2010-09-09 21:57:24 -0400
commit1c24de60e50fb19b94d94225458da17c720f0729 (patch)
treea225907a1b341f629037805f086add137e176f4a /kernel/groups.c
parent94131e174fedd9f3f9bb148cee4be12f2d46d68e (diff)
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/groups.c')
-rw-r--r--kernel/groups.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/groups.c b/kernel/groups.c
index 53b1916c9492..253dc0f35cf4 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)
143 right = group_info->ngroups; 143 right = group_info->ngroups;
144 while (left < right) { 144 while (left < right) {
145 unsigned int mid = (left+right)/2; 145 unsigned int mid = (left+right)/2;
146 int cmp = grp - GROUP_AT(group_info, mid); 146 if (grp > GROUP_AT(group_info, mid))
147 if (cmp > 0)
148 left = mid + 1; 147 left = mid + 1;
149 else if (cmp < 0) 148 else if (grp < GROUP_AT(group_info, mid))
150 right = mid; 149 right = mid;
151 else 150 else
152 return 1; 151 return 1;