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authorAl Viro <viro@zeniv.linux.org.uk>2008-01-25 23:22:26 -0500
committerDavid Teigland <teigland@redhat.com>2008-02-04 01:26:31 -0600
commitef58bccab7c7ef34451aa4ceea39545ef126b666 (patch)
tree56cdbdeba5db2cdca3e3f96a7124a4f83c56e791 /fs/dlm/lock.c
parenta5dd06313dbcec3a2c8a5e4a6f3ddb2a8fc72ec9 (diff)
downloadlinux-linaro-stable-ef58bccab7c7ef34451aa4ceea39545ef126b666.tar.gz
dlm: make find_rsb() fail gracefully when namelen is too large
We *can* get there from receive_request() and dlm_recover_master_copy() with namelen too large if incoming request is invalid; BUG() from DLM_ASSERT() in allocate_rsb() is a bit excessive reaction to that and in case of dlm_recover_master_copy() we would actually oops before that while calculating hash of up to 64Kb worth of data - with data actually being 64 _bytes_ in kmalloc()'ed struct. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David Teigland <teigland@redhat.com>
Diffstat (limited to 'fs/dlm/lock.c')
-rw-r--r--fs/dlm/lock.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 0593dd81d46d..6d98cf9d043d 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -436,11 +436,15 @@ static int find_rsb(struct dlm_ls *ls, char *name, int namelen,
{
struct dlm_rsb *r, *tmp;
uint32_t hash, bucket;
- int error = 0;
+ int error = -EINVAL;
+
+ if (namelen > DLM_RESNAME_MAXLEN)
+ goto out;
if (dlm_no_directory(ls))
flags |= R_CREATE;
+ error = 0;
hash = jhash(name, namelen, 0);
bucket = hash & (ls->ls_rsbtbl_size - 1);