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rpmsg: char: Avoid double destroy of default endpoint

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The rpmsg_dev_remove() in rpmsg_core is the place for releasing
this default endpoint.

So need to avoid destroying the default endpoint in
rpmsg_chrdev_eptdev_destroy(), this should be the same as
rpmsg_eptdev_release(). Otherwise there will be double destroy
issue that ept->refcount report warning:

refcount_t: underflow; use-after-free.

Call trace:
 refcount_warn_saturate+0xf8/0x150
 virtio_rpmsg_destroy_ept+0xd4/0xec
 rpmsg_dev_remove+0x60/0x70

The issue can be reproduced by stopping remoteproc before
closing the /dev/rpmsgX.

Fixes: bea9b79c2d ("rpmsg: char: Add possibility to use default endpoint of the rpmsg device")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/1663725523-6514-1-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
This commit is contained in:
Shengjiu Wang 2022-09-21 09:58:43 +08:00 committed by Mathieu Poirier
parent 06564be4c0
commit 467233a4ac
1 changed files with 3 additions and 1 deletions
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4
drivers/rpmsg/rpmsg_char.c
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@ -76,7 +76,9 @@ int rpmsg_chrdev_eptdev_destroy(struct device *dev, void *data)
mutex_lock(&eptdev->ept_lock);
if (eptdev->ept) {
rpmsg_destroy_ept(eptdev->ept);
/* The default endpoint is released by the rpmsg core */
if (!eptdev->default_ept)
rpmsg_destroy_ept(eptdev->ept);
eptdev->ept = NULL;
}
mutex_unlock(&eptdev->ept_lock);