Messages in this thread | | | Subject | Re: [PATCH] fs:Fix kmemleak leak warning in getname_flags about working on unitialized memory | From | Tetsuo Handa <> | Date | Thu, 4 Aug 2016 21:18:19 +0900 |
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On 2016/08/04 6:48, Nicholas Krause wrote: > This fixes a kmemleak leak warning complaining about working on > unitializied memory as found in the function, getname_flages. Seems > that we are indeed working on unitialized memory, as the filename > char pointer is never made to point to the filname structure's result > member for holding it's name, fix this by using memcpy to copy the > filname structure pointer's, name to the char pointer passed to this > function. > > Signed-off-by: Nicholas Krause <xerofoify@gmail.com> > --- > fs/namei.c | 1 + > mm/early_ioremap.c | 1 + > 2 files changed, 2 insertions(+) > > diff --git a/fs/namei.c b/fs/namei.c > index c386a32..6b18d57 100644 > --- a/fs/namei.c > +++ b/fs/namei.c > @@ -196,6 +196,7 @@ getname_flags(const char __user *filename, int flags, int *empty) > } > } > > + memcpy((char *)result->name, filename, len);
This filename is a __user pointer. Reading with memcpy() is not safe.
> result->uptr = filename; > result->aname = NULL; > audit_getname(result);
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