| From bippy-1.1.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-49803: netdevsim: Fix memory leak of nsim_dev->fa_cookie |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| netdevsim: Fix memory leak of nsim_dev->fa_cookie |
| |
| kmemleak reports this issue: |
| |
| unreferenced object 0xffff8881bac872d0 (size 8): |
| comm "sh", pid 58603, jiffies 4481524462 (age 68.065s) |
| hex dump (first 8 bytes): |
| 04 00 00 00 de ad be ef ........ |
| backtrace: |
| [<00000000c80b8577>] __kmalloc+0x49/0x150 |
| [<000000005292b8c6>] nsim_dev_trap_fa_cookie_write+0xc1/0x210 [netdevsim] |
| [<0000000093d78e77>] full_proxy_write+0xf3/0x180 |
| [<000000005a662c16>] vfs_write+0x1c5/0xaf0 |
| [<000000007aabf84a>] ksys_write+0xed/0x1c0 |
| [<000000005f1d2e47>] do_syscall_64+0x3b/0x90 |
| [<000000006001c6ec>] entry_SYSCALL_64_after_hwframe+0x63/0xcd |
| |
| The issue occurs in the following scenarios: |
| |
| nsim_dev_trap_fa_cookie_write() |
| kmalloc() fa_cookie |
| nsim_dev->fa_cookie = fa_cookie |
| .. |
| nsim_drv_remove() |
| |
| The fa_cookie allocked in nsim_dev_trap_fa_cookie_write() is not freed. To |
| fix, add kfree(nsim_dev->fa_cookie) to nsim_drv_remove(). |
| |
| The Linux kernel CVE team has assigned CVE-2022-49803 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.7 with commit d3cbb907ae57fe5da314b51d949b617b538bdeae and fixed in 6.0.10 with commit 207edad5717e0a5709ce8467f0eff41c607835c9 |
| Issue introduced in 5.7 with commit d3cbb907ae57fe5da314b51d949b617b538bdeae and fixed in 6.1 with commit 064bc7312bd09a48798418663090be0c776183db |
| |
| 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-2022-49803 |
| 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/net/netdevsim/dev.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/207edad5717e0a5709ce8467f0eff41c607835c9 |
| https://git.kernel.org/stable/c/064bc7312bd09a48798418663090be0c776183db |
