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authorJulia Lawall <julia@diku.dk>2008-05-12 14:02:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-05-13 08:02:24 -0700
commit7a6278e5e4bce72ace681ae3cf48209fb63a5420 (patch)
treeba1aba392096d9cffdb53a13d69cef225c2ec044
parent5aecd559871d23a3cc297e544c9d63f0b8441cf4 (diff)
drivers/video/pnx4008: eliminate double free
The function framebuffer_release just calls kfree, so calling kfree subsequently on the same argument represents a double free. The comments with the definition of framebuffer_release in drivers/video/fbsysfs.c suggest that a more elaborate definition of this function is planned, such that the splitting up of framebuffer_release and kfree as done in the second instance might someday make sense, but it does not make sense now. This was found using the following semantic match. (http://www.emn.fr/x-info/coccinelle/) // <smpl> @@ expression E; @@ * kfree(E); ... * framebuffer_release(E); @@ expression E; @@ * framebuffer_release(E); ... * kfree(E); // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Cc: Vitaly Wool <vitalywool@gmail.com> Cc: Krzysztof Helt <krzysztof.h1@wp.pl> Cc: Grigory Tolstolytkin <gtolstolytkin@ru.mvista.com> Cc: Antonino Daplas <adaplas@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/video/pnx4008/pnxrgbfb.c11
1 files changed, 4 insertions, 7 deletions
diff --git a/drivers/video/pnx4008/pnxrgbfb.c b/drivers/video/pnx4008/pnxrgbfb.c
index 685761a..4db6b48 100644
--- a/drivers/video/pnx4008/pnxrgbfb.c
+++ b/drivers/video/pnx4008/pnxrgbfb.c
@@ -100,7 +100,6 @@ static int rgbfb_remove(struct platform_device *pdev)
fb_dealloc_cmap(&info->cmap);
framebuffer_release(info);
platform_set_drvdata(pdev, NULL);
- kfree(info);
}
pnx4008_free_dum_channel(channel_owned, pdev->id);
@@ -168,23 +167,21 @@ static int __devinit rgbfb_probe(struct platform_device *pdev)
ret = fb_alloc_cmap(&info->cmap, 256, 0);
if (ret < 0)
- goto err2;
+ goto err1;
ret = register_framebuffer(info);
if (ret < 0)
- goto err3;
+ goto err2;
platform_set_drvdata(pdev, info);
return 0;
-err3:
- fb_dealloc_cmap(&info->cmap);
err2:
- framebuffer_release(info);
+ fb_dealloc_cmap(&info->cmap);
err1:
pnx4008_free_dum_channel(channel_owned, pdev->id);
err0:
- kfree(info);
+ framebuffer_release(info);
err:
return ret;
}