Messages in this thread | | | Subject | Re: [PATCH v1] ipmi: use %*ph to print small buffer | From | Joe Perches <> | Date | Fri, 11 Oct 2019 07:58:14 -0700 |
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On Fri, 2019-10-11 at 17:52 +0300, Andy Shevchenko wrote: > Use %*ph format to print small buffer as hex string. > > The change is safe since the specifier can handle up to 64 bytes and taking > into account the buffer size of 100 bytes on stack the function has never been > used to dump more than 32 bytes. Note, this also avoids potential buffer > overflow if the length of the input buffer is bigger. [] > diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c [] > @@ -48,14 +48,7 @@ static int handle_one_recv_msg(struct ipmi_smi *intf, > static void ipmi_debug_msg(const char *title, unsigned char *data, > unsigned int len) > { > - int i, pos; > - char buf[100]; > - > - pos = snprintf(buf, sizeof(buf), "%s: ", title); > - for (i = 0; i < len; i++) > - pos += snprintf(buf + pos, sizeof(buf) - pos, > - " %2.2x", data[i]); > - pr_debug("%s\n", buf); > + pr_debug("%s: %*ph\n", title, len, buf); > } > #else > static void ipmi_debug_msg(const char *title, unsigned char *data,
Now you might as well remove the #ifdef DEBUG above this and the empty function in the #else too.
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