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[media] media: s5p-mfc fix invalid memory access from s5p_mfc_release()

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If s5p_mfc_release() runs after s5p_mfc_remove(), the former will access
invalid s5p_mfc_dev pointer saved in the s5p_mfc_ctx and runs into kernel
paging request errors.

Clear ctx dev pointer in s5p_mfc_remove() and change s5p_mfc_release() to
avoid work that requires ctx->dev.

odroid kernel: Unable to handle kernel paging request at virtual address
    f17c1104
odroid kernel: pgd = ebca4000
odroid kernel: [f17c1104] *pgd=6e23d811, *pte=00000000, *ppte=00000000
odroid kernel: Internal error: Oops: 807 [#1] PREEMPT SMP ARM
odroid kernel: Modules linked in: cpufreq_userspace cpufreq_powersave
    cpufreq_conservative s5p_mfc s5p_jpeg v4l2_mem2mem
    videobuf2_dma_contig videobuf2_memops videobuf2_v4l2 videobuf2_core
    v4l2_common videodev media
odroid kernel: Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
odroid kernel: task: c2241400 ti: e7018000 task.ti: e7018000
odroid kernel: PC is at s5p_mfc_reset+0x40/0x28c [s5p_mfc]
odroid kernel: LR is at s5p_mfc_reset+0x34/0x28c [s5p_mfc]
odroid kernel: pc : [<bf15bfbc>]    lr : [<bf15bfb0>] psr: 60010013
odroid kernel: [<bf15bfbc>] (s5p_mfc_reset [s5p_mfc]) from [<bf15c62c>]
    (s5p_mfc_deinit_hw+0x14/0x3c [s5p_mfc])
odroid kernel: [<bf15c62c>] (s5p_mfc_deinit_hw [s5p_mfc]) from [<bf155958>]
    (s5p_mfc_release+0xac/0x1c4 [s5p_mfc])
odroid kernel: [<bf155958>] (s5p_mfc_release [s5p_mfc]) from [<bf021344>]
    (v4l2_release+0x38/0x74 [videodev])
odroid kernel: [<bf021344>] (v4l2_release [videodev]) from [<c01e4274>]
    (__fput+0x80/0x1c8)
odroid kernel: [<c01e4274>] (__fput) from [<c0135c58>]
    (task_work_run+0x94/0xc8)
odroid kernel: [<c0135c58>] (task_work_run) from [<c010a9d4>]
    (do_work_pending+0x7c/0xa4)
odroid kernel: [<c010a9d4>] (do_work_pending) from [<c0107794>]
    (slow_work_pending+0xc/0x20)
odroid kernel: Code: eb3edacc e5953078 e3a06000 e2833c11 (e5836004)

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Tested-by: Luis de Bethencourt <luisbg@osg.samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Shuah Khan 2016-07-08 19:29:25 -03:00 committed by Mauro Carvalho Chehab
parent d188b679f4
commit d695c12c57
1 changed files with 50 additions and 22 deletions
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32
drivers/media/platform/s5p-mfc/s5p_mfc.c
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@ -924,15 +924,20 @@ static int s5p_mfc_release(struct file *file)
struct s5p_mfc_ctx *ctx = fh_to_ctx(file->private_data);
struct s5p_mfc_dev *dev = ctx->dev;
/* if dev is null, do cleanup that doesn't need dev */
mfc_debug_enter();
if (dev)
mutex_lock(&dev->mfc_mutex);
s5p_mfc_clock_on();
vb2_queue_release(&ctx->vq_src);
vb2_queue_release(&ctx->vq_dst);
if (dev) {
/* Mark context as idle */
clear_work_bit_irqsave(ctx);
/* If instance was initialised and not yet freed,
* return instance and free resources */
/*
* If instance was initialised and not yet freed,
* return instance and free resources
*/
if (ctx->state != MFCINST_FREE && ctx->state != MFCINST_INIT) {
mfc_debug(2, "Has to free instance\n");
s5p_mfc_close_mfc_inst(dev, ctx);
@ -948,15 +953,21 @@ static int s5p_mfc_release(struct file *file)
if (s5p_mfc_power_off() < 0)
mfc_err("Power off failed\n");
}
}
mfc_debug(2, "Shutting down clock\n");
s5p_mfc_clock_off();
if (dev)
dev->ctx[ctx->num] = NULL;
s5p_mfc_dec_ctrls_delete(ctx);
v4l2_fh_del(&ctx->fh);
/* vdev is gone if dev is null */
if (dev)
v4l2_fh_exit(&ctx->fh);
kfree(ctx);
mfc_debug_leave();
if (dev)
mutex_unlock(&dev->mfc_mutex);
return 0;
}
@ -1298,9 +1309,26 @@ err_dma:
static int s5p_mfc_remove(struct platform_device *pdev)
{
struct s5p_mfc_dev *dev = platform_get_drvdata(pdev);
struct s5p_mfc_ctx *ctx;
int i;
v4l2_info(&dev->v4l2_dev, "Removing %s\n", pdev->name);
/*
* Clear ctx dev pointer to avoid races between s5p_mfc_remove()
* and s5p_mfc_release() and s5p_mfc_release() accessing ctx->dev
* after s5p_mfc_remove() is run during unbind.
*/
mutex_lock(&dev->mfc_mutex);
for (i = 0; i < MFC_NUM_CONTEXTS; i++) {
ctx = dev->ctx[i];
if (!ctx)
continue;
/* clear ctx->dev */
ctx->dev = NULL;
}
mutex_unlock(&dev->mfc_mutex);
del_timer_sync(&dev->watchdog_timer);
flush_workqueue(dev->watchdog_workqueue);
destroy_workqueue(dev->watchdog_workqueue);