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authorShengjiu Wang <shengjiu.wang@nxp.com>2022-09-21 04:58:43 +0300
committerMathieu Poirier <mathieu.poirier@linaro.org>2022-09-21 20:21:33 +0300
commit467233a4ac29b215d492843d067a9f091e6bf0c5 (patch)
treec5a0ac92621e80179e76b41350a7071f2d6f5fe1 /drivers/rpmsg
parent06564be4c03ff0e0b88c5a4a14a6527fcb070ffd (diff)
downloadlinux-467233a4ac29b215d492843d067a9f091e6bf0c5.tar.xz
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.c4
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);