CVE-2026-68212: media: saa7134: Fix a possible memory leak in saa7134_video_init1

From: Greg Kroah-Hartman <[email protected]>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

media: saa7134: Fix a possible memory leak in saa7134_video_init1

In saa7134_video_init1(), the return value of the first
saa7134_pgtable_alloc() is not checked. If it fails, the function
continues as if successful, leaving the driver with an invalid page
table. Additionally, if vb2_queue_init() for the VBI queue fails after
the video queue page table has been allocated, the allocated memory is
not freed before returning. The second saa7134_pgtable_alloc() also
lacks a return value check. Errors occur during device probing before
the device is fully registered, the normal cleanup path in
saa7134_finidev() is not executed, leading to memory leaks and
potential use of uninitialized DMA resources.

Check the return value of both saa7134_pgtable_alloc() calls and
propagate errors. On failure of any later step, free allocated page
tables to avoid memory leaks. Ensure control handlers are also
released on error to prevent further resource leakage.

Found by code review.

The Linux kernel CVE team has assigned CVE-2026-68212 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 3.16 with commit a00e68888d5d2b583b13d7d58204a27207af95fd and fixed in 6.6.148 with commit 134c979dd721e22f196d71026432ee37d1f5cc38
	Issue introduced in 3.16 with commit a00e68888d5d2b583b13d7d58204a27207af95fd and fixed in 6.12.101 with commit e1ef361ee31d1dba5dcae2cdd50f9c1352df0c23
	Issue introduced in 3.16 with commit a00e68888d5d2b583b13d7d58204a27207af95fd and fixed in 6.18.42 with commit b7936e8cbec1b96b126058eeb005e5b9111df38e
	Issue introduced in 3.16 with commit a00e68888d5d2b583b13d7d58204a27207af95fd and fixed in 7.1.6 with commit 1731dd61b6c0b7435c139951d2b7eada6c9667a8
	Issue introduced in 3.16 with commit a00e68888d5d2b583b13d7d58204a27207af95fd and fixed in 7.2-rc1 with commit f86ed548386e3050e5f8f25b450d09dc009d9a88

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-68212
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/media/pci/saa7134/saa7134-video.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/134c979dd721e22f196d71026432ee37d1f5cc38
	https://git.kernel.org/stable/c/e1ef361ee31d1dba5dcae2cdd50f9c1352df0c23
	https://git.kernel.org/stable/c/b7936e8cbec1b96b126058eeb005e5b9111df38e
	https://git.kernel.org/stable/c/1731dd61b6c0b7435c139951d2b7eada6c9667a8
	https://git.kernel.org/stable/c/f86ed548386e3050e5f8f25b450d09dc009d9a88