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tracing: Fix mmiotrace possible NULL dereferencing of hiter->dev

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If the mmio_pipe_open() fails to find a PCI device, the hiter->dev
will be assigned to NULL. The mmiotrace read() function dereferences the
hiter->dev if hiter exists.

Change the test of the read to not only check hiter being NULL, but also
the hiter->dev before dereferencing it.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260721211143.36dbd559@gandalf.local.home
Fixes: f984b51e07 ("ftrace: add mmiotrace plugin")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Link: https://sashiko.dev/#/patchset/20260715143604.14481-1-gaikwad.dcg%40gmail.com
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2026-07-21 21:11:43 -04:00
parent c1d87e724a
commit 144f29e857
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace_mmiotrace.c
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@ -145,7 +145,7 @@ static ssize_t mmio_read(struct trace_iterator *iter, struct file *filp,
goto print_out;
}
if (!hiter)
if (!hiter || !hiter->dev)
return 0;
mmio_print_pcidev(s, hiter->dev);