From: Meng Tang Date: Tue, 15 Mar 2022 07:48:51 +0000 (+0800) Subject: hamradio: Fix wrong assignment of 'bbc->cfg.loopback' X-Git-Tag: v5.18-rc1~136^2~72 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a8df216630fedadc4e8cc086f0e2e612f9c3d1f4;p=thirdparty%2Fkernel%2Fstable.git hamradio: Fix wrong assignment of 'bbc->cfg.loopback' In file hamradio/baycom_epp.c, the baycom_setmode interface, there is a problem with improper use of strstr. Suppose that when modestr="noloopback", both conditions which are 'strstr(modestr,"noloopback")' and 'strstr(modestr,"loopback")' will be true(not NULL), this lead the bc->cfg.loopback variable will be first assigned to 0, and then reassigned to 1. This will cause 'bc->cfg.loopback = 0' will never take effect. That obviously violates the logic of the code, so adjust the order of their execution to solve the problem. Signed-off-by: Meng Tang Reviewed-by: Dan Carpenter Link: https://lore.kernel.org/r/20220315074851.6456-1-tangmeng@uniontech.com Signed-off-by: Jakub Kicinski --- diff --git a/drivers/net/hamradio/baycom_epp.c b/drivers/net/hamradio/baycom_epp.c index a03d0b4746417..3e69079ed694b 100644 --- a/drivers/net/hamradio/baycom_epp.c +++ b/drivers/net/hamradio/baycom_epp.c @@ -982,10 +982,10 @@ static int baycom_setmode(struct baycom_state *bc, const char *modestr) bc->cfg.extmodem = 0; if (strstr(modestr,"extmodem")) bc->cfg.extmodem = 1; - if (strstr(modestr,"noloopback")) - bc->cfg.loopback = 0; if (strstr(modestr,"loopback")) bc->cfg.loopback = 1; + if (strstr(modestr, "noloopback")) + bc->cfg.loopback = 0; if ((cp = strstr(modestr,"fclk="))) { bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0); if (bc->cfg.fclk < 1000000)