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| author | Jerome Marchand <jmarchan@redhat.com> | 2010-09-09 16:37:59 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-09-09 18:57:24 -0700 |
| commit | 1c24de60e50fb19b94d94225458da17c720f0729 (patch) | |
| tree | a225907a1b341f629037805f086add137e176f4a /kernel/groups.c | |
| parent | 94131e174fedd9f3f9bb148cee4be12f2d46d68e (diff) | |
| download | lwn-1c24de60e50fb19b94d94225458da17c720f0729.tar.gz lwn-1c24de60e50fb19b94d94225458da17c720f0729.zip | |
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.c | 5 |
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) 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; |