CVE-2023-52847
Assigner: Linux
Published: 2024-05-21T15:31:44.513Z
State: PUBLISHED
descriptions: value: In the Linux kernel, the following vulnerability has been resolved:

media: bttv: fix use after free error due to btv->timeout timer

There may be some a race condition between timer function
bttv_irq_timeout and bttv_remove. The timer is setup in
probe and there is no timer_delete operation in remove
function. When it hit kfree btv, the function might still be
invoked, which will cause use after free bug.

This bug is found by static analysis, it may be false positive.

Fix it by adding del_timer_sync invoking to the remove function.

cpu0                cpu1
                  bttv_probe
                    ->timer_setup
                      ->bttv_set_dma
                        ->mod_timer;
bttv_remove
  ->kfree(btv);
                  ->bttv_irq_timeout
                    ->USE btv
affected: product: Linux
vendor: Linux
defaultStatus: unaffected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions: version: 162e6376ac58
lessThan: bbc3b8dd2cb7
status: affected
versionType: git
version: 162e6376ac58
lessThan: b35fdade92c5
status: affected
versionType: git
version: 162e6376ac58
lessThan: 2f3d9198cdae
status: affected
versionType: git
version: 162e6376ac58
lessThan: 51c94256a83f
status: affected
versionType: git
version: 162e6376ac58
lessThan: 20568d06f606
status: affected
versionType: git
version: 162e6376ac58
lessThan: 1871014d6ef4
status: affected
versionType: git
version: 162e6376ac58
lessThan: 847599fffa52
status: affected
versionType: git
version: 162e6376ac58
lessThan: bd5b50b329e8
status: affected
versionType: git
product: Linux
vendor: Linux
defaultStatus: affected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions: version: 4.15
status: affected
version: 0
lessThan: 4.15
status: unaffected
versionType: custom
version: 4.19.299
lessThanOrEqual: 4.19.*
status: unaffected
versionType: custom
version: 5.4.261
lessThanOrEqual: 5.4.*
status: unaffected
versionType: custom
version: 5.10.201
lessThanOrEqual: 5.10.*
status: unaffected
versionType: custom
version: 5.15.139
lessThanOrEqual: 5.15.*
status: unaffected
versionType: custom
version: 6.1.63
lessThanOrEqual: 6.1.*
status: unaffected
versionType: custom
version: 6.5.12
lessThanOrEqual: 6.5.*
status: unaffected
versionType: custom
version: 6.6.2
lessThanOrEqual: 6.6.*
status: unaffected
versionType: custom
version: 6.7
lessThanOrEqual: *
status: unaffected
versionType: original_commit_for_fix
title: media: bttv: fix use after free error due to btv->timeout timer
x_generator: engine: bippy-d175d3acf727