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| author | Shengjiu Wang <shengjiu.wang@nxp.com> | 2022-09-21 09:58:43 +0800 |
|---|---|---|
| committer | Mathieu Poirier <mathieu.poirier@linaro.org> | 2022-09-21 11:21:33 -0600 |
| commit | 467233a4ac29b215d492843d067a9f091e6bf0c5 (patch) | |
| tree | c5a0ac92621e80179e76b41350a7071f2d6f5fe1 /drivers/rpmsg | |
| parent | 06564be4c03ff0e0b88c5a4a14a6527fcb070ffd (diff) | |
| download | linux-stable-467233a4ac29b215d492843d067a9f091e6bf0c5.tar.gz linux-stable-467233a4ac29b215d492843d067a9f091e6bf0c5.tar.bz2 linux-stable-467233a4ac29b215d492843d067a9f091e6bf0c5.zip | |
rpmsg: char: Avoid double destroy of default endpoint
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: bea9b79c2d10 ("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>
Diffstat (limited to 'drivers/rpmsg')
| -rw-r--r-- | drivers/rpmsg/rpmsg_char.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c index 0850ae34fb88..3e0b8f3496ed 100644 --- a/drivers/rpmsg/rpmsg_char.c +++ b/drivers/rpmsg/rpmsg_char.c @@ -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); |