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staging: vboxsf: fix dereference of pointer dentry before it is null checked 

Currently the pointer dentry is being dereferenced before it is
being null checked.  Fix this by only dereferencing dentry once
we know it is not null.

Addresses-Coverity: ("Dereference before null check")
Fixes: df4028658f ("staging: Add VirtualBox guest shared folder (vboxsf) support")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20191105175108.79824-1-colin.king@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Colin Ian King 2019-11-05 17:51:08 +00:00 committed by Greg Kroah-Hartman
parent 32e9f6cb07
commit 94fed40410
1 changed files with 2 additions and 1 deletions
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3
drivers/staging/vboxsf/utils.c
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@ -174,7 +174,7 @@ int vboxsf_stat_dentry(struct dentry *dentry, struct shfl_fsobjinfo *info)
int vboxsf_inode_revalidate(struct dentry *dentry)
{
struct vboxsf_sbi *sbi = VBOXSF_SBI(dentry->d_sb);
struct vboxsf_sbi *sbi;
struct vboxsf_inode *sf_i;
struct shfl_fsobjinfo info;
struct timespec64 prev_mtime;
@ -187,6 +187,7 @@ int vboxsf_inode_revalidate(struct dentry *dentry)
inode = d_inode(dentry);
prev_mtime = inode->i_mtime;
sf_i = VBOXSF_I(inode);
sbi = VBOXSF_SBI(dentry->d_sb);
if (!sf_i->force_restat) {
if (time_before(jiffies, dentry->d_time + sbi->o.ttl))
return 0;