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| author | Matthew Auld <[email protected]> | 2024-02-02 17:14:36 +0000 |
|---|---|---|
| committer | Thomas Hellström <[email protected]> | 2024-02-08 09:51:04 +0100 |
| commit | 9e3fc1d65d4e8cf302e289847ab165ad9358fdb2 (patch) | |
| tree | cfd774f26d8911d6480a4f7a079db36341ab6cb7 /lib/test_fortify/write_overflow-strncpy-src.c | |
| parent | 95c058c8ef1d5d9e39ab2039a5eea4d5b93f4117 (diff) | |
drm/xe/vm: don't ignore error when in_kthread
If GUP fails and we are in_kthread, we can have pinned = 0 and ret = 0.
If that happens we call sg_alloc_append_table_from_pages() with n_pages
= 0, which is not well behaved and can trigger:
kernel BUG at include/linux/scatterlist.h:115!
depending on if the pages array happens to be zeroed or not. Even if we
don't hit that it crashes later when trying to dma_map the returned
table.
Fixes: dd08ebf6c352 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Signed-off-by: Matthew Auld <[email protected]>
Cc: Thomas Hellström <[email protected]>
Cc: Matthew Brost <[email protected]>
Reviewed-by: Matthew Brost <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit 8087199cd5951c1eba26003b3e4296dbb2110adf)
Signed-off-by: Thomas Hellström <[email protected]>
Diffstat (limited to 'lib/test_fortify/write_overflow-strncpy-src.c')
0 files changed, 0 insertions, 0 deletions