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fix(preview-generator): Throw exception before dividing by zero when generating previews #36692

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merged 1 commit into from
May 16, 2023
Merged

fix(preview-generator): Throw exception before dividing by zero when generating previews #36692

merged 1 commit into from
May 16, 2023

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tcitworld
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If the maximum preview generated gives some kind of invalid IImage, it's dimensions and filename can be set to zero. And then later we do a division by zero to keep the aspect ratio of the previews.

ErrorException: Warning: Division by zero
#11 /var/www/nc/nextcloud-25.0.1/lib/private/Preview/Generator.php(516): OC\Preview\Generator::generatePreview
#10 /var/www/nc/nextcloud-25.0.1/lib/private/Preview/Generator.php(208): OC\Preview\Generator::generatePreviews
#9 /var/www/nc/nextcloud-25.0.1/lib/private/Preview/Generator.php(114): OC\Preview\Generator::getPreview
#8 /var/www/nc/nextcloud-25.0.1/lib/private/PreviewManager.php(185): OC\PreviewManager::getPreview
#7 /var/www/nc/nextcloud-25.0.1/core/Controller/PreviewController.php(144): OC\Core\Controller\PreviewController::fetchPreview
#6 /var/www/nc/nextcloud-25.0.1/core/Controller/PreviewController.php(113): OC\Core\Controller\PreviewController::getPreviewByFileId

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@tcitworld
fix(preview-generator): Throw exception before dividing by zero when …
e60888d 
…generating previews

If the maximum preview generated gives some kind of invalid IImage, it's dimentions and filename can be set to zero.
And then later we do a division by zero to keep the aspect ratio of the previews.

Signed-off-by: Thomas Citharel <[email protected]>
@tcitworld tcitworld requested a review from a team February 13, 2023 15:50
@tcitworld tcitworld self-assigned this Feb 13, 2023
@tcitworld tcitworld requested review from ArtificialOwl, icewind1991 and blizzz and removed request for a team February 13, 2023 15:50
@tcitworld tcitworld marked this pull request as ready for review February 13, 2023 15:51
szaimen
szaimen approved these changes May 16, 2023
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LGTM but didnt test

@szaimen szaimen added this to the Nextcloud 27 milestone May 16, 2023
@szaimen szaimen merged commit 6608f84 into master May 16, 2023
@szaimen szaimen deleted the throw-exception-to-avoid-division-by-zero branch May 16, 2023 22:14
@blizzz blizzz mentioned this pull request May 17, 2023
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@szaimen szaimen szaimen approved these changes

@ChristophWurst ChristophWurst ChristophWurst approved these changes

@ArtificialOwl ArtificialOwl Awaiting requested review from ArtificialOwl ArtificialOwl was automatically assigned from nextcloud/server-backend

@icewind1991 icewind1991 Awaiting requested review from icewind1991 icewind1991 was automatically assigned from nextcloud/server-backend

@blizzz blizzz Awaiting requested review from blizzz blizzz was automatically assigned from nextcloud/server-backend

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@tcitworld @ChristophWurst @szaimen