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getname_kernel() needs to make sure that ->name != ->iname in long case

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missed it in "kill struct filename.separate" several years ago.

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2018-04-08 11:57:10 -04:00
parent 8613a209ff
commit 30ce4d1903
1 changed files with 2 additions and 1 deletions
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3
fs/namei.c
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@ -222,9 +222,10 @@ getname_kernel(const char * filename)
if (len <= EMBEDDED_NAME_MAX) { if (len <= EMBEDDED_NAME_MAX) {
result->name = (char *)result->iname; result->name = (char *)result->iname;
} else if (len <= PATH_MAX) { } else if (len <= PATH_MAX) {
const size_t size = offsetof(struct filename, iname[1]);
struct filename *tmp; struct filename *tmp;
tmp = kmalloc(sizeof(*tmp), GFP_KERNEL); tmp = kmalloc(size, GFP_KERNEL);
if (unlikely(!tmp)) { if (unlikely(!tmp)) {
__putname(result); __putname(result);
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);