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authorNamhyung Kim <namhyung.kim@lge.com>2013-06-07 17:00:33 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-06-13 09:25:13 -0700
commitc45fe24c84eb35565a252c4fe2dd851cee22cb3e (patch)
treef4f87f69bd948bc2003542affe00e1ae6625dac8 /Documentation/RCU/00-INDEX
parent24d54932440284584060455a81156f7ca4edff0e (diff)
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tracing: Fix possible NULL pointer dereferences
commit 6a76f8c0ab19f215af2a3442870eeb5f0e81998d upstream. Currently set_ftrace_pid and set_graph_function files use seq_lseek for their fops. However seq_open() is called only for FMODE_READ in the fops->open() so that if an user tries to seek one of those file when she open it for writing, it sees NULL seq_file and then panic. It can be easily reproduced with following command: $ cd /sys/kernel/debug/tracing $ echo 1234 | sudo tee -a set_ftrace_pid In this example, GNU coreutils' tee opens the file with fopen(, "a") and then the fopen() internally calls lseek(). Link: http://lkml.kernel.org/r/1365663302-2170-1-git-send-email-namhyung@kernel.org Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Namhyung Kim <namhyung.kim@lge.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> [ lizf: adjust context ] Signed-off-by: Li Zefan <lizefan@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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