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teach filename_lookup() to treat NULL filename as ""

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2024-10-19 20:32:39 -04:00
parent 9852d85ec9
commit 5b313bcb6e
1 changed files with 3 additions and 1 deletions
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4
fs/namei.c
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@ -588,6 +588,7 @@ struct nameidata {
unsigned seq;
} *stack, internal[EMBEDDED_LEVELS];
struct filename *name;
const char *pathname;
struct nameidata *saved;
unsigned root_seq;
int dfd;
@ -606,6 +607,7 @@ static void __set_nameidata(struct nameidata *p, int dfd, struct filename *name)
p->depth = 0;
p->dfd = dfd;
p->name = name;
p->pathname = likely(name) ? name->name : "";
p->path.mnt = NULL;
p->path.dentry = NULL;
p->total_link_count = old ? old->total_link_count : 0;
@ -2439,7 +2441,7 @@ static int link_path_walk(const char *name, struct nameidata *nd)
static const char *path_init(struct nameidata *nd, unsigned flags)
{
int error;
const char *s = nd->name->name;
const char *s = nd->pathname;
/* LOOKUP_CACHED requires RCU, ask caller to retry */
if ((flags & (LOOKUP_RCU | LOOKUP_CACHED)) == LOOKUP_CACHED)