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authorTom Rix <trix@redhat.com>2021-01-05 23:21:26 +0300
committerSteve French <stfrench@microsoft.com>2021-01-13 21:55:29 +0300
commit77b6ec01c29aade01701aa30bf1469acc7f2be76 (patch)
treedd03b8bc345b4e7dedbb5939f1fc8d84150199fa /fs/cifs/dfs_cache.c
parent7c53f6b671f4aba70ff15e1b05148b10d58c2837 (diff)
downloadlinux-77b6ec01c29aade01701aa30bf1469acc7f2be76.tar.xz
cifs: check pointer before freeing
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> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com> CC: <stable@vger.kernel.org> # v5.0+ Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/dfs_cache.c')
-rw-r--r--fs/cifs/dfs_cache.c3
1 files changed, 2 insertions, 1 deletions
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);
}
/**