linux-kernel - [PATCH 5.15 070/913] remoteproc: Fix count check in rproc_coredump

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Date:   Tue,  5 Apr 2022 09:18:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alistair Delva <adelva@...gle.com>,
        Rishabh Bhatnagar <rishabhb@...eaurora.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Sibi Sankar <sibis@...eaurora.org>,
        linux-remoteproc@...r.kernel.org, kernel-team@...roid.com
Subject: [PATCH 5.15 070/913] remoteproc: Fix count check in rproc_coredump_write()

From: Alistair Delva <adelva@...gle.com>

commit f89672cc3681952f2d06314981a6b45f8b0045d1 upstream.

Check count for 0, to avoid a potential underflow. Make the check the
same as the one in rproc_recovery_write().

Fixes: 3afdc59e4390 ("remoteproc: Add coredump debugfs entry")
Signed-off-by: Alistair Delva <adelva@...gle.com>
Cc: Rishabh Bhatnagar <rishabhb@...eaurora.org>
Cc: stable@...r.kernel.org
Cc: Ohad Ben-Cohen <ohad@...ery.com>
Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Sibi Sankar <sibis@...eaurora.org>
Cc: linux-remoteproc@...r.kernel.org
Cc: kernel-team@...roid.com
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Link: https://lore.kernel.org/r/20220119232139.1125908-1-adelva@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/remoteproc/remoteproc_debugfs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/remoteproc/remoteproc_debugfs.c
+++ b/drivers/remoteproc/remoteproc_debugfs.c
@@ -76,7 +76,7 @@ static ssize_t rproc_coredump_write(stru
 	int ret, err = 0;
 	char buf[20];
 
-	if (count > sizeof(buf))
+	if (count < 1 || count > sizeof(buf))
 		return -EINVAL;
 
 	ret = copy_from_user(buf, user_buf, count);