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dma-buf/udmabuf: Fix NULL pointer dereference in udmabuf_create

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There is a potential execution path in which pointer memfd is NULL when
passed as argument to fput(), hence there is a NULL pointer dereference
in fput().

Fix this by null checking *memfd* before calling fput().

Addresses-Coverity-ID: 1473174 ("Explicit null dereferenced")
Fixes: fbb0de7950 ("Add udmabuf misc device")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20180904190749.GA9308@embeddedor.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gustavo A. R. Silva 2018-09-04 14:07:49 -05:00 • committed by Gerd Hoffmann
commit 683a0e630c
1 changed files with 2 additions and 1 deletions
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3
drivers/dma-buf/udmabuf.c
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@ -194,7 +194,8 @@ err_put_pages:
while (pgbuf > 0)
put_page(ubuf->pages[--pgbuf]);
err_free_ubuf:
fput(memfd);
if (memfd)
fput(memfd);
kfree(ubuf->pages);
kfree(ubuf);
return ret;