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authorJulia Lawall <julia@diku.dk>2011-03-23 16:42:56 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-23 19:46:39 -0700
commitd9d691f584bd012d235c35279c043a2ccd23d7d7 (patch)
tree9094c048d6df951f14e2fb1cc790366791fdd7d5 /drivers/tty
parent73210a135b9dd53ba59beb4ced5a55633ae65b2f (diff)
downloadop-kernel-dev-d9d691f584bd012d235c35279c043a2ccd23d7d7.zip
op-kernel-dev-d9d691f584bd012d235c35279c043a2ccd23d7d7.tar.gz
drivers/tty/bfin_jtag_comm.c: avoid calling put_tty_driver on NULL
put_tty_driver calls tty_driver_kref_put on its argument, and then tty_driver_kref_put calls kref_put on the address of a field of this argument. kref_put checks for NULL, but in this case the field is likely to have some offset and so the result of taking its address will not be NULL. Labels are added to be able to skip over the call to put_tty_driver when the argument will be NULL. The semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression *x; @@ *if (x == NULL) { ... * put_tty_driver(x); ... return ...; } // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Cc: Torben Hohn <torbenh@gmx.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/bfin_jtag_comm.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/tty/bfin_jtag_comm.c b/drivers/tty/bfin_jtag_comm.c
index 16402445..03c285b 100644
--- a/drivers/tty/bfin_jtag_comm.c
+++ b/drivers/tty/bfin_jtag_comm.c
@@ -251,11 +251,11 @@ static int __init bfin_jc_init(void)
bfin_jc_write_buf.head = bfin_jc_write_buf.tail = 0;
bfin_jc_write_buf.buf = kmalloc(CIRC_SIZE, GFP_KERNEL);
if (!bfin_jc_write_buf.buf)
- goto err;
+ goto err_buf;
bfin_jc_driver = alloc_tty_driver(1);
if (!bfin_jc_driver)
- goto err;
+ goto err_driver;
bfin_jc_driver->owner = THIS_MODULE;
bfin_jc_driver->driver_name = DRV_NAME;
@@ -275,7 +275,9 @@ static int __init bfin_jc_init(void)
err:
put_tty_driver(bfin_jc_driver);
+ err_driver:
kfree(bfin_jc_write_buf.buf);
+ err_buf:
kthread_stop(bfin_jc_kthread);
return ret;
}
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