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realpath: Avoid overwriting preexisting error (CVE-2021-3998)
Set errno and failure for paths that are too long only if no other error occurred earlier. Related: BZ #28770 Reviewed-by: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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@ -404,7 +404,7 @@ error:
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{
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if (dest - rname <= get_path_max ())
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rname = strcpy (resolved, rname);
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else
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else if (!failed)
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{
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failed = true;
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__set_errno (ENAMETOOLONG);
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