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In such case, if codecs_count can get incremented to value more than MAX_CODEC_NUM, there can be OOB access. Keep a check for max accessible memory before accessing it. Cc: stable@vger.kernel.org Fixes: 1a73374a04e5 ("media: venus: hfi_parser: add common capability parse= r") Signed-off-by: Vikash Garodia Reviewed-by: Bryan O'Donoghue --- drivers/media/platform/qcom/venus/hfi_parser.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/media/platform/qcom/venus/hfi_parser.c b/drivers/media= /platform/qcom/venus/hfi_parser.c index 3df241dc3a118bcdeb2c28a6ffdb907b644d5653..27d0172294d5154f4839e8cef17= 2f9a619dfa305 100644 --- a/drivers/media/platform/qcom/venus/hfi_parser.c +++ b/drivers/media/platform/qcom/venus/hfi_parser.c @@ -23,6 +23,8 @@ static void init_codecs(struct venus_core *core) return; =20 for_each_set_bit(bit, &core->dec_codecs, MAX_CODEC_NUM) { + if (core->codecs_count >=3D MAX_CODEC_NUM) + return; cap =3D &caps[core->codecs_count++]; cap->codec =3D BIT(bit); cap->domain =3D VIDC_SESSION_TYPE_DEC; @@ -30,6 +32,8 @@ static void init_codecs(struct venus_core *core) } =20 for_each_set_bit(bit, &core->enc_codecs, MAX_CODEC_NUM) { + if (core->codecs_count >=3D MAX_CODEC_NUM) + return; 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When words_count reaches last word, data can access memory beyond the total payload. Avoid this case by not allowing the loop for the last word count. Cc: stable@vger.kernel.org Fixes: 1a73374a04e5 ("media: venus: hfi_parser: add common capability parse= r") Signed-off-by: Vikash Garodia --- drivers/media/platform/qcom/venus/hfi_parser.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/platform/qcom/venus/hfi_parser.c b/drivers/media= /platform/qcom/venus/hfi_parser.c index 27d0172294d5154f4839e8cef172f9a619dfa305..20d9ea3626e9c4468d5f7dbd678= 743135f027c86 100644 --- a/drivers/media/platform/qcom/venus/hfi_parser.c +++ b/drivers/media/platform/qcom/venus/hfi_parser.c @@ -303,7 +303,7 @@ u32 hfi_parser(struct venus_core *core, struct venus_in= st *inst, void *buf, memset(core->caps, 0, sizeof(core->caps)); } =20 - while (words_count) { + while (words_count > 1) { data =3D word + 1; =20 switch (*word) { --=20 2.34.1 From nobody Sun Nov 24 14:23:05 2024 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4E0851D0DC4; 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Firmware can modify this value to an invalid large value. In such situation, empty_space will be bigger than the space actually available. Since new_wr_idx is not checked, so the following code will result in an OOB write. ... qsize =3D qhdr->q_size if (wr_idx >=3D rd_idx) empty_space =3D qsize - (wr_idx - rd_idx) .... if (new_wr_idx < qsize) { memcpy(wr_ptr, packet, dwords << 2) --> OOB write Add check to ensure qsize is within the allocated size while reading and writing packets into the queue. Cc: stable@vger.kernel.org Fixes: d96d3f30c0f2 ("[media] media: venus: hfi: add Venus HFI files") Signed-off-by: Vikash Garodia Reviewed-by: Bryan O'Donoghue --- drivers/media/platform/qcom/venus/hfi_venus.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c b/drivers/media/= platform/qcom/venus/hfi_venus.c index f9437b6412b91c2483670a2b11f4fd43f3206404..50d92214190d88eff273a5ba3f9= 5486f758bcc05 100644 --- a/drivers/media/platform/qcom/venus/hfi_venus.c +++ b/drivers/media/platform/qcom/venus/hfi_venus.c @@ -187,6 +187,9 @@ static int venus_write_queue(struct venus_hfi_device *h= dev, /* ensure rd/wr indices's are read from memory */ rmb(); =20 + if (qsize > IFACEQ_QUEUE_SIZE/4) + return -EINVAL; + if (wr_idx >=3D rd_idx) empty_space =3D qsize - (wr_idx - rd_idx); else @@ -255,6 +258,9 @@ static int venus_read_queue(struct venus_hfi_device *hd= ev, wr_idx =3D qhdr->write_idx; qsize =3D qhdr->q_size; =20 + if (qsize > IFACEQ_QUEUE_SIZE/4) + return -EINVAL; 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OOB write is possible when the size is made higher than actual sfr data buffer. Cc: stable@vger.kernel.org Fixes: d96d3f30c0f2 ("[media] media: venus: hfi: add Venus HFI files") Signed-off-by: Vikash Garodia Reviewed-by: Bryan O'Donoghue --- drivers/media/platform/qcom/venus/hfi_venus.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c b/drivers/media/= platform/qcom/venus/hfi_venus.c index 50d92214190d88eff273a5ba3f95486f758bcc05..c19d6bf686d0f31c6a2f551de3f= 7eb08031bde85 100644 --- a/drivers/media/platform/qcom/venus/hfi_venus.c +++ b/drivers/media/platform/qcom/venus/hfi_venus.c @@ -1041,18 +1041,23 @@ static void venus_sfr_print(struct venus_hfi_device= *hdev) { struct device *dev =3D hdev->core->dev; struct hfi_sfr *sfr =3D hdev->sfr.kva; + u32 size; void *p; =20 if (!sfr) return; =20 - p =3D memchr(sfr->data, '\0', sfr->buf_size); + size =3D sfr->buf_size; + if (size > ALIGNED_SFR_SIZE) + return; + + p =3D memchr(sfr->data, '\0', size); /* * SFR isn't guaranteed to be NULL terminated since SYS_ERROR indicates * that Venus is in the process of crashing. */ if (!p) - sfr->data[sfr->buf_size - 1] =3D '\0'; + sfr->data[size - 1] =3D '\0'; =20 dev_err_ratelimited(dev, "SFR message from FW: %s\n", sfr->data); } --=20 2.34.1