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GET /api/1.2/patches/2222820/?format=api
{ "id": 2222820, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2222820/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260413190713.283939-3-ematsumiya@suse.de/", "project": { "id": 12, "url": "http://patchwork.ozlabs.org/api/1.2/projects/12/?format=api", "name": "Linux CIFS Client", "link_name": "linux-cifs-client", "list_id": "linux-cifs.vger.kernel.org", "list_email": "linux-cifs@vger.kernel.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260413190713.283939-3-ematsumiya@suse.de>", "list_archive_url": null, "date": "2026-04-13T19:07:08", "name": "[3/8] smb: client: compress: fix counting in LZ77 match finding", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "792b20f8bbbfde36d532be844c60d2bfbf303a75", "submitter": { "id": 78375, "url": "http://patchwork.ozlabs.org/api/1.2/people/78375/?format=api", "name": "Enzo Matsumiya", "email": "ematsumiya@suse.de" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260413190713.283939-3-ematsumiya@suse.de/mbox/", "series": [ { "id": 499741, "url": "http://patchwork.ozlabs.org/api/1.2/series/499741/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/list/?series=499741", "date": "2026-04-13T19:07:09", "name": "[1/8] smb: client: compress: fix buffer overrun in lz77_compress()", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/499741/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2222820/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2222820/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-cifs+bounces-10777-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-cifs@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", 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h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n\t mime-version:mime-version:\n\t content-transfer-encoding:content-transfer-encoding:\n\t in-reply-to:in-reply-to:references:references;\n\tbh=zMF5k9xlh64JtzVfTCCTVu0y6xLgrEG2XWvMV8dxisc=;\n\tb=xT+rrlcjKT8OyBHNrvL8rbKS9xW8Zkda9be+Jlb7VgZQmeoYptlExF06WNh7wQVoL7PsLM\n\t9gunUGnszmmOya5TjS+us6lUAvwCMzUtdJ5B5cEqJ857OYKhwZDC6Gpl+XIzPhXikzYfm9\n\tFj67uuPa41y7eZ0Y0uMN8b5HtyRauEk=", "v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n\ts=susede2_ed25519; t=1776107261;\n\th=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n\t mime-version:mime-version:\n\t content-transfer-encoding:content-transfer-encoding:\n\t in-reply-to:in-reply-to:references:references;\n\tbh=zMF5k9xlh64JtzVfTCCTVu0y6xLgrEG2XWvMV8dxisc=;\n\tb=98VuPZTr8ryuBPNbsSW//adWi4rErbiqydCk0SjGa2+vrj6Uefq+FE9ImNDAl/or6Cu5hi\n\tlmIiEmd8jeCpnGBg==", "v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_rsa;\n\tt=1776107261;\n h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n\t mime-version:mime-version:\n\t content-transfer-encoding:content-transfer-encoding:\n\t in-reply-to:in-reply-to:references:references;\n\tbh=zMF5k9xlh64JtzVfTCCTVu0y6xLgrEG2XWvMV8dxisc=;\n\tb=xT+rrlcjKT8OyBHNrvL8rbKS9xW8Zkda9be+Jlb7VgZQmeoYptlExF06WNh7wQVoL7PsLM\n\t9gunUGnszmmOya5TjS+us6lUAvwCMzUtdJ5B5cEqJ857OYKhwZDC6Gpl+XIzPhXikzYfm9\n\tFj67uuPa41y7eZ0Y0uMN8b5HtyRauEk=", "v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n\ts=susede2_ed25519; t=1776107261;\n\th=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n\t mime-version:mime-version:\n\t content-transfer-encoding:content-transfer-encoding:\n\t in-reply-to:in-reply-to:references:references;\n\tbh=zMF5k9xlh64JtzVfTCCTVu0y6xLgrEG2XWvMV8dxisc=;\n\tb=98VuPZTr8ryuBPNbsSW//adWi4rErbiqydCk0SjGa2+vrj6Uefq+FE9ImNDAl/or6Cu5hi\n\tlmIiEmd8jeCpnGBg==" ], "From": "Enzo Matsumiya <ematsumiya@suse.de>", "To": "linux-cifs@vger.kernel.org", "Cc": "smfrench@gmail.com,\n\tpc@manguebit.com,\n\tronniesahlberg@gmail.com,\n\tsprasad@microsoft.com,\n\ttom@talpey.com,\n\tbharathsm@microsoft.com,\n\thenrique.carvalho@suse.com", "Subject": "[PATCH 3/8] smb: client: compress: fix counting in LZ77 match finding", "Date": "Mon, 13 Apr 2026 16:07:08 -0300", "Message-ID": "<20260413190713.283939-3-ematsumiya@suse.de>", "X-Mailer": "git-send-email 2.53.0", "In-Reply-To": "<20260413190713.283939-1-ematsumiya@suse.de>", "References": "<20260413190713.283939-1-ematsumiya@suse.de>", "Precedence": "bulk", "X-Mailing-List": "linux-cifs@vger.kernel.org", "List-Id": "<linux-cifs.vger.kernel.org>", "List-Subscribe": "<mailto:linux-cifs+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-cifs+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Spam-Score": "-2.80", "X-Spam-Level": "", "X-Spamd-Result": "default: False [-2.80 / 50.00];\n\tBAYES_HAM(-3.00)[100.00%];\n\tNEURAL_HAM_LONG(-1.00)[-1.000];\n\tMID_CONTAINS_FROM(1.00)[];\n\tR_MISSING_CHARSET(0.50)[];\n\tNEURAL_HAM_SHORT(-0.20)[-0.999];\n\tMIME_GOOD(-0.10)[text/plain];\n\tTO_MATCH_ENVRCPT_ALL(0.00)[];\n\tFUZZY_RATELIMITED(0.00)[rspamd.com];\n\tFROM_HAS_DN(0.00)[];\n\tRCVD_VIA_SMTP_AUTH(0.00)[];\n\tFREEMAIL_CC(0.00)[gmail.com,manguebit.com,microsoft.com,talpey.com,suse.com];\n\tARC_NA(0.00)[];\n\tTO_DN_NONE(0.00)[];\n\tRCVD_TLS_ALL(0.00)[];\n\tFROM_EQ_ENVFROM(0.00)[];\n\tRCVD_COUNT_TWO(0.00)[2];\n\tRCPT_COUNT_SEVEN(0.00)[8];\n\tDBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:mid,suse.de:email];\n\tMIME_TRACE(0.00)[0:+];\n\tDKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519];\n\tFREEMAIL_ENVRCPT(0.00)[gmail.com]", "X-Spam-Flag": "NO" }, "content": "- lz77_match_len() increments @cur before checking for equality,\n leading to off-by-one match len in some cases.\n\n Fix by moving pointers increment to inside the loop.\n Also rename @wnd arg to @match (more accurate name).\n- both lz77_match_len() and lz77_compress() checked for\n \"buf + step < end\" when the correct is \"<=\" for such cases.\n\nSigned-off-by: Enzo Matsumiya <ematsumiya@suse.de>\n---\n fs/smb/client/compress/lz77.c | 17 ++++++++++-------\n 1 file changed, 10 insertions(+), 7 deletions(-)", "diff": "diff --git a/fs/smb/client/compress/lz77.c b/fs/smb/client/compress/lz77.c\nindex c1e7fada6e61..61cdf1c14612 100644\n--- a/fs/smb/client/compress/lz77.c\n+++ b/fs/smb/client/compress/lz77.c\n@@ -48,17 +48,17 @@ static __always_inline void lz77_write32(u32 *ptr, u32 v)\n \tput_unaligned_le32(v, ptr);\n }\n \n-static __always_inline u32 lz77_match_len(const void *wnd, const void *cur, const void *end)\n+static __always_inline u32 lz77_match_len(const void *match, const void *cur, const void *end)\n {\n \tconst void *start = cur;\n \tu64 diff;\n \n \t/* Safe for a do/while because otherwise we wouldn't reach here from the main loop. */\n \tdo {\n-\t\tdiff = lz77_read64(cur) ^ lz77_read64(wnd);\n+\t\tdiff = lz77_read64(cur) ^ lz77_read64(match);\n \t\tif (!diff) {\n \t\t\tcur += LZ77_STEP_SIZE;\n-\t\t\twnd += LZ77_STEP_SIZE;\n+\t\t\tmatch += LZ77_STEP_SIZE;\n \n \t\t\tcontinue;\n \t\t}\n@@ -67,10 +67,13 @@ static __always_inline u32 lz77_match_len(const void *wnd, const void *cur, cons\n \t\tcur += count_trailing_zeros(diff) >> 3;\n \n \t\treturn (cur - start);\n-\t} while (likely(cur + LZ77_STEP_SIZE < end));\n+\t} while (likely(cur + LZ77_STEP_SIZE <= end));\n \n-\twhile (cur < end && lz77_read8(cur++) == lz77_read8(wnd++))\n-\t\t;\n+\t/* Fallback to byte-by-byte comparison for last <8 bytes. */\n+\twhile (cur < end && lz77_read8(cur) == lz77_read8(match)) {\n+\t\tcur++;\n+\t\tmatch++;\n+\t}\n \n \treturn (cur - start);\n }\n@@ -195,7 +198,7 @@ noinline int lz77_compress(const void *src, u32 slen, void *dst, u32 *dlen)\n \t\t\tflag_pos = dstp;\n \t\t\tdstp += 4;\n \t\t}\n-\t} while (likely(srcp + LZ77_STEP_SIZE < end));\n+\t} while (likely(srcp + LZ77_STEP_SIZE <= end));\n \n \twhile (srcp < end) {\n \t\tu32 c = umin(end - srcp, 32 - flag_count);\n", "prefixes": [ "3/8" ] }