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| author | Arnd Bergmann <arnd@arndb.de> | 2021-03-22 17:02:41 +0100 |
|---|---|---|
| committer | James Morris <jamorris@linux.microsoft.com> | 2021-03-24 13:52:19 -0700 |
| commit | 82e5d8cc768b0c7b03c551a9ab1f8f3f68d5f83f (patch) | |
| tree | 3e783f3e8be609c2f0d61a51f8b5c1ae32b7d484 | |
| parent | f40ddce88593482919761f74910f42f4b84c004b (diff) | |
| download | linux-82e5d8cc768b0c7b03c551a9ab1f8f3f68d5f83f.tar.bz2 | |
security: commoncap: fix -Wstringop-overread warning
gcc-11 introdces a harmless warning for cap_inode_getsecurity:
security/commoncap.c: In function ‘cap_inode_getsecurity’:
security/commoncap.c:440:33: error: ‘memcpy’ reading 16 bytes from a region of size 0 [-Werror=stringop-overread]
440 | memcpy(&nscap->data, &cap->data, sizeof(__le32) * 2 * VFS_CAP_U32);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The problem here is that tmpbuf is initialized to NULL, so gcc assumes
it is not accessible unless it gets set by vfs_getxattr_alloc(). This is
a legitimate warning as far as I can tell, but the code is correct since
it correctly handles the error when that function fails.
Add a separate NULL check to tell gcc about it as well.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: James Morris <jamorris@linux.microsoft.com>
| -rw-r--r-- | security/commoncap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/security/commoncap.c b/security/commoncap.c index 26c1cb725dcb..2bdeacd32e3f 100644 --- a/security/commoncap.c +++ b/security/commoncap.c @@ -391,7 +391,7 @@ int cap_inode_getsecurity(struct inode *inode, const char *name, void **buffer, &tmpbuf, size, GFP_NOFS); dput(dentry); - if (ret < 0) + if (ret < 0 || !tmpbuf) return ret; fs_ns = inode->i_sb->s_user_ns; |