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misc: genwqe: handle a first DMA address of zero

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genwqe_setup_sgl() uses zero as the initial previous DMA address. DMA
address zero is valid, so a first entry at that address enters the
merge path before last_s has been assigned and dereferences NULL.

Only merge adjacent mappings after an SGL data entry has been created.

Signed-off-by: Yousef Alhouseen <alhouseenyousef@gmail.com>
Link: https://patch.msgid.link/20260630104923.53827-1-alhouseenyousef@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yousef Alhouseen 2026-06-30 12:49:23 +02:00 committed by Greg Kroah-Hartman
parent 7a7a0d97d5
commit d401772a9e
1 changed files with 1 additions and 1 deletions
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2
drivers/misc/genwqe/card_utils.c
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@ -413,7 +413,7 @@ int genwqe_setup_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl,
size -= size_to_map;
map_offs = 0;
if (prev_daddr == daddr) {
if (last_s && prev_daddr == daddr) {
u32 prev_len = be32_to_cpu(last_s->len);
/* pr_info("daddr combining: "