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Fix zpl_revalidate() NULL deref

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In zpl_revalidate() it's possible for the nameidata to be NULL
for kernels which still accept the parameter.  In particular,
lookup_one_len() calls d_revalidate() with a NULL nameidata.

Resolve the issue by checking for a NULL nameidata in which case
just set the flags to 0.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1226
This commit is contained in:
Brian Behlendorf 2013-01-22 09:05:49 -08:00
parent ee93035378
commit 09a661e960
1 changed files with 1 additions and 1 deletions
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2
module/zfs/zpl_inode.c
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@ -396,7 +396,7 @@ static int
#ifdef HAVE_D_REVALIDATE_NAMEIDATA #ifdef HAVE_D_REVALIDATE_NAMEIDATA
zpl_revalidate(struct dentry *dentry, struct nameidata *nd) zpl_revalidate(struct dentry *dentry, struct nameidata *nd)
{ {
unsigned int flags = nd->flags; unsigned int flags = (nd ? nd->flags : 0);
#else #else
zpl_revalidate(struct dentry *dentry, unsigned int flags) zpl_revalidate(struct dentry *dentry, unsigned int flags)
{ {