ksmbd: preserve data during overlapping copy chunk

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Copying an overlapping range within the same file through
do_splice_direct() can overwrite source data that has not yet been
read. This corrupts the destination when the target range starts
inside and after the source range.

Handle overlapping ranges with a bounded temporary buffer. Copy from
the end when the destination follows the source and from the beginning
otherwise, providing memmove semantics without allocating the entire
copy length.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

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Namjae Jeon 2026-07-07 00:46:32 +09:00

parent c1c200924f

commit fd309860ef

1 changed files with 66 additions and 10 deletions

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fs/smb/server/vfs.c

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