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dlm: validate length in dlm_search_rsb_tree

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The len parameter in dlm_dump_rsb_name() is not validated and comes
from network messages. When it exceeds DLM_RESNAME_MAXLEN, it can
cause out-of-bounds write in dlm_search_rsb_tree().

Add length validation to prevent potential buffer overflow.

Signed-off-by: Ezrak1e <ezrakiez@gmail.com>
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Ezrak1e 2026-01-20 10:35:06 -05:00 • committed by David Teigland
parent 1416bd508c
commit 080e5563f8
1 changed files with 2 additions and 1 deletions
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3
fs/dlm/lock.c
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@ -626,7 +626,8 @@ int dlm_search_rsb_tree(struct rhashtable *rhash, const void *name, int len,
struct dlm_rsb **r_ret)
{
char key[DLM_RESNAME_MAXLEN] = {};
if (len > DLM_RESNAME_MAXLEN)
return -EINVAL;
memcpy(key, name, len);
*r_ret = rhashtable_lookup_fast(rhash, &key, dlm_rhash_rsb_params);
if (*r_ret)