jbd2: Avoid printing outside the boundary of the buffer

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Theoretically possible that "%pg" will take all room for the j_devname
and hence the "-%lu" will go outside the boundary due to unconditional
sprintf() in use. To make this code more robust, replace two sequential
s*printf():s by a single call and then replace forbidden character.
It's possible to do this way, because '/' won't ever be in the result
of "-%lu".

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230605170553.7835-2-andriy.shevchenko@linux.intel.com

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Andy Shevchenko 2023-06-05 20:05:51 +03:00 • committed by Kees Cook

parent 8515e4a746

commit 7afb6d8fa8

1 changed files with 2 additions and 4 deletions

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fs/jbd2/journal.c

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