From: Nicholas Bellinger Date: Sun, 23 Feb 2014 12:52:44 +0000 (+0000) Subject: target/sbc: Fix sbc_dif_copy_prot addr offset bug X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=10762e80489e73e2d52bf78e0869f253f42821bd;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git target/sbc: Fix sbc_dif_copy_prot addr offset bug This patch fixes a bug in sbc_dif_copy_prot() where the updated addr offset did not take into account the case where the associated scatterlist had not been incremented. This addresses the case where incoming protection scatterlists may contain a length smaller than PAGE_SIZE across multiple entires, when the target protection scatterlists are always being explicitly filled up to PAGE_SIZE before adding another entry. Cc: Martin K. Petersen Cc: Christoph Hellwig Cc: Hannes Reinecke Cc: Sagi Grimberg Cc: Or Gerlitz Signed-off-by: Nicholas Bellinger --- diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index a4489444ffbc..ef1a58a134aa 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -1074,7 +1074,7 @@ sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, struct scatterlist *psg; void *paddr, *addr; unsigned int i, len, left; - unsigned int offset = 0; + unsigned int offset = sg_off; left = sectors * dev->prot_length; @@ -1084,11 +1084,10 @@ sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, if (offset >= sg->length) { sg = sg_next(sg); offset = 0; - sg_off = sg->offset; } paddr = kmap_atomic(sg_page(psg)) + psg->offset; - addr = kmap_atomic(sg_page(sg)) + sg_off; + addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; if (read) memcpy(paddr, addr, len);