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* [Cocci] Software analysis with SmPL around unchecked function calls
@ 2019-10-10 12:56 Markus Elfring
  2019-10-10 13:13 ` Julia Lawall
  0 siblings, 1 reply; 33+ messages in thread
From: Markus Elfring @ 2019-10-10 12:56 UTC (permalink / raw)
  To: Coccinelle

Hello,

I would like to try another source code analysis approach out with
the software combination “Coccinelle 1.0.8-00004-g842075f7”.

@display@
expression x;
statement is, es;
@@
(
*x = kmemdup(...);
|if (...)
*x = kmemdup(...);
)
(if (!x) is
|if (...) is else es
|
 ... when any
     when != x
)


This SmPL small script can point an update candidate out like
the function “imx_pd_bind” as expected.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/imx/parallel-display.c?id=43b815c6a8e7dbccb5b8bd9c4b099c24bc22d135#n197
https://elixir.bootlin.com/linux/v5.4-rc2/source/drivers/gpu/drm/imx/parallel-display.c#L197

Unfortunately, I find also some false positives then at other places.

Example:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/cpufreq/sfi-cpufreq.c?id=8a8c600de5dc1d9a7f4b83269fddc80ebd3dd045#n23
https://elixir.bootlin.com/linux/v5.4-rc2/source/drivers/cpufreq/sfi-cpufreq.c#L23

…
@@ -37,7 +37,6 @@ static int sfi_parse_freq(struct sfi_tab
 	pentry = (struct sfi_freq_table_entry *)sb->pentry;
 	totallen = num_freq_table_entries * sizeof(*pentry);

-	sfi_cpufreq_array = kmemdup(pentry, totallen, GFP_KERNEL);
 	if (!sfi_cpufreq_array)
 		return -ENOMEM;
…


Would you like to clarify this situation for the semantic patch language?

Regards,
Markus
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^ permalink raw reply	[flat|nested] 33+ messages in thread

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Thread overview: 33+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-10-10 12:56 [Cocci] Software analysis with SmPL around unchecked function calls Markus Elfring
2019-10-10 13:13 ` Julia Lawall
2019-10-10 13:35   ` Markus Elfring
2019-10-10 13:38     ` Julia Lawall
2019-10-10 14:04       ` Markus Elfring
     [not found]         ` <alpine.DEB.2.21.1910101606420.2305@hadrien>
2019-10-10 14:15           ` Markus Elfring
     [not found]             ` <alpine.DEB.2.21.1910102053440.2500@hadrien>
2019-10-11  5:11               ` Markus Elfring
2019-10-11  6:07                 ` Julia Lawall
2019-10-11  7:03                   ` Markus Elfring
     [not found]                     ` <alpine.DEB.2.21.1910110906390.2662@hadrien>
2019-10-11  7:30                       ` Markus Elfring
2019-10-11  9:23                       ` Markus Elfring
2019-10-10 16:25       ` Markus Elfring
2019-10-18 12:54   ` [Cocci] Software analysis with SmPL around unchecked pointer " Markus Elfring
2019-10-18 13:31     ` Julia Lawall
2019-10-18 13:42       ` Markus Elfring
2019-10-18 13:49         ` Julia Lawall
2019-10-18 14:20           ` Markus Elfring
2019-10-18 14:30             ` Julia Lawall
2019-10-18 14:34               ` Markus Elfring
2019-10-18 14:39                 ` Julia Lawall
2019-10-18 14:46                   ` Markus Elfring
2019-10-18 14:52                     ` Julia Lawall
2019-10-18 14:56                       ` Markus Elfring
2019-10-18 16:00       ` Markus Elfring
2019-10-18 16:06         ` Julia Lawall
2019-10-18 16:32           ` Markus Elfring
2019-10-19 15:33         ` Markus Elfring
2019-10-19 15:41           ` Julia Lawall
2019-10-19 16:04             ` Markus Elfring
2019-10-19 19:40             ` Markus Elfring
2019-10-20  5:42               ` Julia Lawall
2019-10-20  6:04                 ` Markus Elfring
2019-10-20  9:22                 ` Markus Elfring

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