* [brauner-vfs:vfs.fixes 30/31] fs/afs/symlink.c:130 afs_do_read_symlink() error: we previously assumed 'vnode->directory' could be null (see line 96)
@ 2026-05-14 19:37 kernel test robot
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From: kernel test robot @ 2026-05-14 19:37 UTC (permalink / raw)
To: oe-kbuild; +Cc: lkp, Dan Carpenter
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: Christian Brauner <christianvanbrauner@gmail.com>
TO: David Howells <dhowells@redhat.com>
CC: Christian Brauner <brauner@kernel.org>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs.fixes
head: 45205929a3a3310e4978f4097d8ed4fca36b2c32
commit: c0410adf3da6db46f3513411fcf95e63c2f1d1ad [30/31] afs: Fix the locking used by afs_get_link()
:::::: branch date: 2 days ago
:::::: commit date: 2 days ago
config: i386-randconfig-r073-20260514 (https://download.01.org/0day-ci/archive/20260515/202605150307.KNKEp1AH-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
smatch: v0.5.0-9185-gbcc58b9c
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202605150307.KNKEp1AH-lkp@intel.com/
smatch warnings:
fs/afs/symlink.c:130 afs_do_read_symlink() error: we previously assumed 'vnode->directory' could be null (see line 96)
vim +130 fs/afs/symlink.c
c0410adf3da6db4 David Howells 2026-05-12 79
c0410adf3da6db4 David Howells 2026-05-12 80 /*
c0410adf3da6db4 David Howells 2026-05-12 81 * Read a symlink in a single download.
c0410adf3da6db4 David Howells 2026-05-12 82 */
c0410adf3da6db4 David Howells 2026-05-12 83 static ssize_t afs_do_read_symlink(struct afs_vnode *vnode)
c0410adf3da6db4 David Howells 2026-05-12 84 {
c0410adf3da6db4 David Howells 2026-05-12 85 struct afs_symlink *symlink;
c0410adf3da6db4 David Howells 2026-05-12 86 struct iov_iter iter;
c0410adf3da6db4 David Howells 2026-05-12 87 ssize_t ret;
c0410adf3da6db4 David Howells 2026-05-12 88 loff_t i_size;
c0410adf3da6db4 David Howells 2026-05-12 89
c0410adf3da6db4 David Howells 2026-05-12 90 i_size = i_size_read(&vnode->netfs.inode);
c0410adf3da6db4 David Howells 2026-05-12 91 if (i_size > PAGE_SIZE - 1) {
c0410adf3da6db4 David Howells 2026-05-12 92 trace_afs_file_error(vnode, -EFBIG, afs_file_error_dir_big);
c0410adf3da6db4 David Howells 2026-05-12 93 return -EFBIG;
c0410adf3da6db4 David Howells 2026-05-12 94 }
c0410adf3da6db4 David Howells 2026-05-12 95
c0410adf3da6db4 David Howells 2026-05-12 @96 if (!vnode->directory) {
c0410adf3da6db4 David Howells 2026-05-12 97 size_t cur_size = 0;
c0410adf3da6db4 David Howells 2026-05-12 98
c0410adf3da6db4 David Howells 2026-05-12 99 ret = netfs_alloc_folioq_buffer(NULL,
c0410adf3da6db4 David Howells 2026-05-12 100 &vnode->directory, &cur_size, PAGE_SIZE,
c0410adf3da6db4 David Howells 2026-05-12 101 mapping_gfp_mask(vnode->netfs.inode.i_mapping));
c0410adf3da6db4 David Howells 2026-05-12 102 vnode->directory_size = PAGE_SIZE - 1;
c0410adf3da6db4 David Howells 2026-05-12 103 if (ret < 0)
c0410adf3da6db4 David Howells 2026-05-12 104 return ret;
c0410adf3da6db4 David Howells 2026-05-12 105 }
c0410adf3da6db4 David Howells 2026-05-12 106
c0410adf3da6db4 David Howells 2026-05-12 107 iov_iter_folio_queue(&iter, ITER_DEST, vnode->directory, 0, 0, PAGE_SIZE);
c0410adf3da6db4 David Howells 2026-05-12 108
c0410adf3da6db4 David Howells 2026-05-12 109 /* AFS requires us to perform the read of a symlink as a single unit to
c0410adf3da6db4 David Howells 2026-05-12 110 * avoid issues with the content being changed between reads.
c0410adf3da6db4 David Howells 2026-05-12 111 */
c0410adf3da6db4 David Howells 2026-05-12 112 ret = netfs_read_single(&vnode->netfs.inode, NULL, &iter);
c0410adf3da6db4 David Howells 2026-05-12 113 if (ret >= 0) {
c0410adf3da6db4 David Howells 2026-05-12 114 i_size = ret;
c0410adf3da6db4 David Howells 2026-05-12 115 if (i_size > PAGE_SIZE - 1) {
c0410adf3da6db4 David Howells 2026-05-12 116 trace_afs_file_error(vnode, -EFBIG, afs_file_error_dir_big);
c0410adf3da6db4 David Howells 2026-05-12 117 return -EFBIG;
c0410adf3da6db4 David Howells 2026-05-12 118 }
c0410adf3da6db4 David Howells 2026-05-12 119 vnode->directory_size = i_size;
c0410adf3da6db4 David Howells 2026-05-12 120
c0410adf3da6db4 David Howells 2026-05-12 121 /* Copy the symlink. */
c0410adf3da6db4 David Howells 2026-05-12 122 symlink = kmalloc_flex(struct afs_symlink, content, i_size + 1,
c0410adf3da6db4 David Howells 2026-05-12 123 GFP_KERNEL);
c0410adf3da6db4 David Howells 2026-05-12 124 if (!symlink)
c0410adf3da6db4 David Howells 2026-05-12 125 return -ENOMEM;
c0410adf3da6db4 David Howells 2026-05-12 126
c0410adf3da6db4 David Howells 2026-05-12 127 refcount_set(&symlink->ref, 1);
c0410adf3da6db4 David Howells 2026-05-12 128 symlink->content[i_size] = 0;
c0410adf3da6db4 David Howells 2026-05-12 129
c0410adf3da6db4 David Howells 2026-05-12 @130 const char *s = kmap_local_folio(folioq_folio(vnode->directory, 0), 0);
c0410adf3da6db4 David Howells 2026-05-12 131
c0410adf3da6db4 David Howells 2026-05-12 132 memcpy(symlink->content, s, i_size);
c0410adf3da6db4 David Howells 2026-05-12 133 kunmap_local(s);
c0410adf3da6db4 David Howells 2026-05-12 134
c0410adf3da6db4 David Howells 2026-05-12 135 afs_replace_symlink(vnode, symlink);
c0410adf3da6db4 David Howells 2026-05-12 136 }
c0410adf3da6db4 David Howells 2026-05-12 137
c0410adf3da6db4 David Howells 2026-05-12 138 if (!fscache_cookie_enabled(netfs_i_cookie(&vnode->netfs))) {
c0410adf3da6db4 David Howells 2026-05-12 139 netfs_free_folioq_buffer(vnode->directory);
c0410adf3da6db4 David Howells 2026-05-12 140 vnode->directory = NULL;
c0410adf3da6db4 David Howells 2026-05-12 141 vnode->directory_size = 0;
c0410adf3da6db4 David Howells 2026-05-12 142 }
c0410adf3da6db4 David Howells 2026-05-12 143
c0410adf3da6db4 David Howells 2026-05-12 144 return ret;
c0410adf3da6db4 David Howells 2026-05-12 145 }
c0410adf3da6db4 David Howells 2026-05-12 146
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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2026-05-14 19:37 [brauner-vfs:vfs.fixes 30/31] fs/afs/symlink.c:130 afs_do_read_symlink() error: we previously assumed 'vnode->directory' could be null (see line 96) kernel test robot
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