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crypto: scomp - Fix off-by-one bug when calculating last page

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Fix off-by-one bug in the last page calculation for src and dst.

Reported-by: Nhat Pham <nphamcs@gmail.com>
Fixes: 2d3553ecb4 ("crypto: scomp - Remove support for some non-trivial SG lists")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2025-04-21 11:31:31 +08:00
parent aece1cf146
commit 002ba346e3
1 changed files with 5 additions and 5 deletions
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10
crypto/scompress.c
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@ -215,8 +215,8 @@ static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
spage = nth_page(spage, soff / PAGE_SIZE);
soff = offset_in_page(soff);
n = slen / PAGE_SIZE;
n += (offset_in_page(slen) + soff - 1) / PAGE_SIZE;
n = (slen - 1) / PAGE_SIZE;
n += (offset_in_page(slen - 1) + soff) / PAGE_SIZE;
if (PageHighMem(nth_page(spage, n)) &&
size_add(soff, slen) > PAGE_SIZE)
break;
@ -243,9 +243,9 @@ static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
dpage = nth_page(dpage, doff / PAGE_SIZE);
doff = offset_in_page(doff);
n = dlen / PAGE_SIZE;
n += (offset_in_page(dlen) + doff - 1) / PAGE_SIZE;
if (PageHighMem(dpage + n) &&
n = (dlen - 1) / PAGE_SIZE;
n += (offset_in_page(dlen - 1) + doff) / PAGE_SIZE;
if (PageHighMem(nth_page(dpage, n)) &&
size_add(doff, dlen) > PAGE_SIZE)
break;
dst = kmap_local_page(dpage) + doff;