virt/sev-guest: Return -EIO if certificate buffer is not large enough
Commit 47894e0f ("virt/sev-guest: Prevent IV reuse in the SNP guest driver") changed the behavior associated with the return value when the caller does not supply a large enough certificate buffer. Prior to the commit a value of -EIO was returned. Now, 0 is returned. This breaks the established ABI with the user. Change the code to detect the buffer size error and return -EIO. Fixes: 47894e0f ("virt/sev-guest: Prevent IV reuse in the SNP guest driver") Reported-by:Larry Dewey <larry.dewey@amd.com> Signed-off-by:
Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by:
Borislav Petkov (AMD) <bp@alien8.de> Tested-by:
Larry Dewey <larry.dewey@amd.com> Cc: <stable@kernel.org> Link: https://lore.kernel.org/r/2afbcae6daf13f7ad5a4296692e0a0fe1bc1e4ee.1677083979.git.thomas.lendacky@amd.com
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