diff --git a/bspatch.c b/bspatch.c
index 8d95633..ab77722 100644
--- a/bspatch.c
+++ b/bspatch.c

@@ -187,6 +187,10 @@
 		};
 
 		/* Sanity-check */
+		if ((ctrl[0] < 0) || (ctrl[1] < 0))
+			errx(1,"Corrupt patch\n");
+
+		/* Sanity-check */
 		if(newpos+ctrl[0]>newsize)
 			errx(1,"Corrupt patch\n");
ml'/>
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<div class='path'>path: <a href='/guix/log/?id=0f89d91411f68fbac0e020fbfe92a6bf880065ac'>root</a>/<a href='/guix/log/gnu?id=0f89d91411f68fbac0e020fbfe92a6bf880065ac'>gnu</a>/<a href='/guix/log/gnu/system?id=0f89d91411f68fbac0e020fbfe92a6bf880065ac'>system</a>/<a href='/guix/log/gnu/system/uuid.scm?id=0f89d91411f68fbac0e020fbfe92a6bf880065ac'>uuid.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/system/uuid.scm?id=0f89d91411f68fbac0e020fbfe92a6bf880065ac&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-09-23 18:17:17 +0200'>2021-09-23</span></td><td><a href='/guix/commit/gnu/system/uuid.scm?id=90604348e14913da48327da05113d7da8ae7655a'>uuid: Support XFS.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-11-07 13:40:46 +0100'>2020-11-07</span></td><td><a href='/guix/commit/gnu/system/uuid.scm?id=e87471dc510bc393e3306fba86f919dc6bf89b7b'>uuid: Add support for bcachefs.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-07-26 18:35:10 +0200'>2020-07-26</span></td><td><a href='/guix/commit/gnu/system/uuid.scm?id=675e56221e3dfc58cac94bf30835f16a9c41d530'>file-systems: Add NTFS support.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>

Age	Commit message (Expand)	Author
2021-09-23	uuid: Support XFS....	Tobias Geerinckx-Rice
2020-11-07	uuid: Add support for bcachefs....	Tobias Geerinckx-Rice
2020-07-26	file-systems: Add NTFS support....	Mathieu Othacehe