[git commit branch/1_30_stable] sed: Fix backslash parsing for 'w' command arg

Denys Vlasenko vda.linux at googlemail.com
Thu Feb 14 13:40:57 UTC 2019

commit: https://git.busybox.net/busybox/commit/?id=b65db51ac1e7a3fe90d1b6dddcb3a860e5574984
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/1_30_stable

If there's any whitespace between w and the filename, parse_file_cmd
writes to the wrong offset when trying to fix up backslashes.

This can be seen in the asan build with busybox sed -e 'w 0\\'

Signed-off-by: Brian Foley <bpfoley at google.com>
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
 editors/sed.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/editors/sed.c b/editors/sed.c
index 1054c1302..cddb0c732 100644
--- a/editors/sed.c
+++ b/editors/sed.c
@@ -387,7 +387,7 @@ static int parse_file_cmd(/*sed_cmd_t *sed_cmd,*/ const char *filecmdstr, char *
 		bb_error_msg_and_die("empty filename");
 	*retval = xstrndup(filecmdstr+start, idx-start+hack+1);
 	if (hack)
-		(*retval)[idx] = '\\';
+		(*retval)[idx-start] = '\\';
 	return idx;

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