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authorTakashi Iwai <tiwai@suse.de>2018-07-19 11:01:04 +0200
committerTakashi Iwai <tiwai@suse.de>2018-07-23 09:06:33 +0200
commitdfef01e150824b0e6da750cacda8958188d29aea (patch)
tree0718893e1055b764ffc89f6ca2673478ba791533 /sound/pci
parentALSA: hda/realtek - Yet another Clevo P950 quirk entry (diff)
downloadlinux-dfef01e150824b0e6da750cacda8958188d29aea.tar.xz
linux-dfef01e150824b0e6da750cacda8958188d29aea.zip
ALSA: memalloc: Don't exceed over the requested size
snd_dma_alloc_pages_fallback() tries to allocate pages again when the allocation fails with reduced size. But the first try actually *increases* the size to power-of-two, which may give back a larger chunk than the requested size. This confuses the callers, e.g. sgbuf assumes that the size is equal or less, and it may result in a bad loop due to the underflow and eventually lead to Oops. The code of this function seems incorrectly assuming the usage of get_order(). We need to decrease at first, then align to power-of-two. Reported-and-tested-by: he, bo <bo.he@intel.com> Reported-by: zhang jun <jun.zhang@intel.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci')
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