perf trace: Check for vfs_getname.pathname length
It shouldn't be zero, but if the 'perf probe' on getname_flags() (or elsewhere in the future we need to probe to catch the pathname for syscalls like 'open' being copied from userspace to the kernel) is misplaced somehow, then we will end up not allocating space and trying to copy the "" empty string to ttrace->filename.name, causing a segfault, fix it. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-c4f1t6sx1nczuzop19r5si5s@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -1656,6 +1656,8 @@ static int trace__vfs_getname(struct trace *trace, struct perf_evsel *evsel,
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goto out;
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filename_len = strlen(filename);
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if (filename_len == 0)
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goto out;
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if (ttrace->filename.namelen < filename_len) {
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char *f = realloc(ttrace->filename.name, filename_len + 1);
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