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staging: r8188eu: Fix potential memory leak or NULL dereference

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In routine c2h_wk_callback(() following a kmalloc() call, the
error recovery is flawed. If the kmalloc() returns a pointer
that is not NULL, and the following c2h_evt_read() fails, the
code will leak that buffer. If the kmalloc() fails, a NULL
dereference will occur in the following code.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Link: https://lore.kernel.org/r/20210806213235.22349-1-Larry.Finger@lwfinger.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Larry Finger
2021-08-06 16:32:35 -05:00
committed by Greg Kroah-Hartman
parent 859c57f606
commit dfac77baa2
1 changed files with 5 additions and 1 deletions
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6
drivers/staging/r8188eu/core/rtw_cmd.c
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@@ -1908,8 +1908,12 @@ static void c2h_wk_callback(struct work_struct *work)
c2h_evt = kmalloc(16, GFP_KERNEL);
if (c2h_evt) {
/* This C2H event is not read, read & clear now */
if (c2h_evt_read(adapter, (u8 *)c2h_evt) != _SUCCESS)
if (c2h_evt_read(adapter, (u8 *)c2h_evt) != _SUCCESS) {
kfree(c2h_evt);
continue;
}
} else {
return;
}
}