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platform_kernel-5.15
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pti: double-free security PTI fix 

This patch fixes a double-free error that will not always be
seen unless /dev/pti char interface is stressed.

Signed-off-by: J Freyensee <james_p_freyensee@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
J Freyensee 2011-05-25 14:38:18 -07:00 committed by Greg Kroah-Hartman
parent 9d031d94da
commit 29021bccea
1 changed files with 3 additions and 2 deletions
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5
drivers/misc/pti.c
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@ -317,7 +317,8 @@ EXPORT_SYMBOL_GPL(pti_request_masterchannel);
* a master, channel ID address * a master, channel ID address
* used to write to PTI HW. * used to write to PTI HW.
* *
* @mc: master, channel apeture ID address to be released. * @mc: master, channel apeture ID address to be released. This
* will de-allocate the structure via kfree().
*/ */
void pti_release_masterchannel(struct pti_masterchannel *mc) void pti_release_masterchannel(struct pti_masterchannel *mc)
{ {
@ -581,7 +582,7 @@ static int pti_char_open(struct inode *inode, struct file *filp)
static int pti_char_release(struct inode *inode, struct file *filp) static int pti_char_release(struct inode *inode, struct file *filp)
{ {
pti_release_masterchannel(filp->private_data); pti_release_masterchannel(filp->private_data);
kfree(filp->private_data); filp->private_data = NULL;
return 0; return 0;
} }