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Make sure that make_create_in_sticky() never sees uninitialized value of dir_mode

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make sure nd->dir_mode is always initialized after success exit from
link_path_walk(); in case of empty path it did not happen.

Reported-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
Tested-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-09-19 17:55:58 +01:00
parent 77573fa310
commit 1a97d899ec
1 changed files with 3 additions and 1 deletions
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4
fs/namei.c
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@ -2114,8 +2114,10 @@ static int link_path_walk(const char *name, struct nameidata *nd)
return PTR_ERR(name);
while (*name=='/')
name++;
if (!*name)
if (!*name) {
nd->dir_mode = 0; // short-circuit the 'hardening' idiocy
return 0;
}
/* At this point we know we have a real path component. */
for(;;) {