Messages in this thread Patch in this message | | | From | trix@redhat ... | Subject | [PATCH] cifs: check pointer before freeing | Date | Tue, 5 Jan 2021 12:21:26 -0800 |
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From: Tom Rix <trix@redhat.com>
clang static analysis reports this problem
dfs_cache.c:591:2: warning: Argument to kfree() is a constant address (18446744073709551614), which is not memory allocated by malloc() kfree(vi); ^~~~~~~~~
In dfs_cache_del_vol() the volume info pointer 'vi' being freed is the return of a call to find_vol(). The large constant address is find_vol() returning an error.
Add an error check to dfs_cache_del_vol() similar to the one done in dfs_cache_update_vol().
Fixes: 54be1f6c1c37 ("cifs: Add DFS cache routines") Signed-off-by: Tom Rix <trix@redhat.com> --- fs/cifs/dfs_cache.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/cifs/dfs_cache.c b/fs/cifs/dfs_cache.c index 6ad6ba5f6ebe..0fdb0de7ff86 100644 --- a/fs/cifs/dfs_cache.c +++ b/fs/cifs/dfs_cache.c @@ -1260,7 +1260,8 @@ void dfs_cache_del_vol(const char *fullpath) vi = find_vol(fullpath); spin_unlock(&vol_list_lock); - kref_put(&vi->refcnt, vol_release); + if (!IS_ERR(vi)) + kref_put(&vi->refcnt, vol_release); } /** -- 2.27.0
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