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chdir(2): unspaghettify a bit...

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2025-10-31 13:56:45 -04:00
parent f770e4c1a4
commit 4e9654c2bb
1 changed files with 10 additions and 17 deletions
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27
fs/open.c
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@@ -558,26 +558,19 @@ SYSCALL_DEFINE1(chdir, const char __user *, filename)
struct path path;
int error;
unsigned int lookup_flags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
struct filename *name = getname(filename);
CLASS(filename, name)(filename);
retry:
error = filename_lookup(AT_FDCWD, name, lookup_flags, &path, NULL);
if (error)
goto out;
error = path_permission(&path, MAY_EXEC | MAY_CHDIR);
if (error)
goto dput_and_out;
set_fs_pwd(current->fs, &path);
dput_and_out:
path_put(&path);
if (retry_estale(error, lookup_flags)) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
if (!error) {
error = path_permission(&path, MAY_EXEC | MAY_CHDIR);
if (!error)
set_fs_pwd(current->fs, &path);
path_put(&path);
if (retry_estale(error, lookup_flags)) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
}
out:
putname(name);
return error;
}