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chdev_driver: Avoid NULL pointer dereference when bch->refs == 255. From Juha Niskanen

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Gregory Nutt
2015-03-12 07:58:36 -06:00
parent 26b9b5a252
commit dba41a7048
1 changed files with 1 additions and 1 deletions
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drivers/bch/bchdev_driver.c
+1 -1
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@@ -307,7 +307,7 @@ static int bch_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
FAR struct bchlib_s **bchr = (FAR struct bchlib_s **)((uintptr_t)arg); FAR struct bchlib_s **bchr = (FAR struct bchlib_s **)((uintptr_t)arg);
bchlib_semtake(bch); bchlib_semtake(bch);
if (!bchr && bch->refs < 255) if (!bchr || bch->refs == MAX_OPENCNT)
{ {
ret = -EINVAL; ret = -EINVAL;
} }