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staging: echo.c: fix memory leakage 

we should check the return value of calling function fir16_create(): a NULL
value means the memory allocation fails.

this patch also cleans up the error handling in function function oslec_create()

Signed-off-by: Cong Ding <dinggnu@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Cong Ding 2012-12-22 17:12:26 +01:00 committed by Greg Kroah-Hartman
parent 78855c7a7c
commit 0902468846
1 changed files with 26 additions and 13 deletions
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39
drivers/staging/echo/echo.c
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@ -229,6 +229,7 @@ struct oslec_state *oslec_create(int len, int adaption_mode)
{
struct oslec_state *ec;
int i;
const int16_t *history;
ec = kzalloc(sizeof(*ec), GFP_KERNEL);
if (!ec)
@ -238,15 +239,22 @@ struct oslec_state *oslec_create(int len, int adaption_mode)
ec->log2taps = top_bit(len);
ec->curr_pos = ec->taps - 1;
for (i = 0; i < 2; i++) {
ec->fir_taps16[i] =
kcalloc(ec->taps, sizeof(int16_t), GFP_KERNEL);
if (!ec->fir_taps16[i])
goto error_oom;
}
ec->fir_taps16[0] =
kcalloc(ec->taps, sizeof(int16_t), GFP_KERNEL);
if (!ec->fir_taps16[0])
goto error_oom_0;
fir16_create(&ec->fir_state, ec->fir_taps16[0], ec->taps);
fir16_create(&ec->fir_state_bg, ec->fir_taps16[1], ec->taps);
ec->fir_taps16[1] =
kcalloc(ec->taps, sizeof(int16_t), GFP_KERNEL);
if (!ec->fir_taps16[1])
goto error_oom_1;
history = fir16_create(&ec->fir_state, ec->fir_taps16[0], ec->taps);
if (!history)
goto error_state;
history = fir16_create(&ec->fir_state_bg, ec->fir_taps16[1], ec->taps);
if (!history)
goto error_state_bg;
for (i = 0; i < 5; i++)
ec->xvtx[i] = ec->yvtx[i] = ec->xvrx[i] = ec->yvrx[i] = 0;
@ -256,7 +264,7 @@ struct oslec_state *oslec_create(int len, int adaption_mode)
ec->snapshot = kcalloc(ec->taps, sizeof(int16_t), GFP_KERNEL);
if (!ec->snapshot)
goto error_oom;
goto error_snap;
ec->cond_met = 0;
ec->Pstates = 0;
@ -269,10 +277,15 @@ struct oslec_state *oslec_create(int len, int adaption_mode)
return ec;
error_oom:
for (i = 0; i < 2; i++)
kfree(ec->fir_taps16[i]);
error_snap:
fir16_free(&ec->fir_state_bg);
error_state_bg:
fir16_free(&ec->fir_state);
error_state:
kfree(ec->fir_taps16[1]);
error_oom_1:
kfree(ec->fir_taps16[0]);
error_oom_0:
kfree(ec);
return NULL;
}