Hi people,
In the file "/linux/drivers/media/pci/ngene/ngene-core.c", there is a
null pointer dereference at line 1480.
Code in the function "static int init_channel(struct ngene_channel *chan)"
======================================
if (io & NGENE_IO_TSIN) {
chan->fe = NULL; // Set to NULL
if (ni->demod_attach[nr]) { // First condition
ret = ni->demod_attach[nr](chan);
if (ret < 0) // Another condition
goto err; // Goto that avoids
the problem
}
if (chan->fe && ni->tuner_attach[nr]) { // Condition that
tests the null pointer
ret = ni->tuner_attach[nr](chan);
if (ret < 0)
goto err;
}
}
=====================================
"chan->fe" is set to NULL, then it tests for something (I have no idea
what it's doing, I know nothing about this driver), if the results of
the first two if conditions fail to reach the goto, then it will test
the condition with the null pointer, which will cause a crash. I don't
know if the kernel can recover from null pointers, I think not.
--Alexandre-Xavier
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